{"id":4026,"date":"2023-05-10T15:11:09","date_gmt":"2023-05-10T15:11:09","guid":{"rendered":"https:\/\/longchangchemical.com\/?post_type=product&p=4026"},"modified":"2026-05-08T02:59:54","modified_gmt":"2026-05-08T02:59:54","slug":"4-methoxyphenol-cas-150-76-5","status":"publish","type":"product","link":"https:\/\/longchangchemical.com\/hu\/product\/4-methoxyphenol-cas-150-76-5\/","title":{"rendered":"Hidrokinon \/ 4-Methoxyphenol CAS 150-76-5"},"content":{"rendered":"

Hidrokinon \/ 4-Methoxyphenol CAS 150-76-5<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
T\u00e9telek<\/td>\nStandard<\/td>\n<\/tr>\n
Megjelen\u00e9s<\/td>\nFeh\u00e9r krist\u00e1lyos pehely<\/td>\n<\/tr>\n
Hydroquinone(123-31-9\uff09%<\/td>\n\u22640.05<\/td>\n<\/tr>\n
\u00c9get\u00e9si marad\u00e9k%<\/td>\n\u22640.01<\/td>\n<\/tr>\n
Sz\u00e1r\u00edt\u00e1si vesztes\u00e9g%<\/td>\n\u22640.3<\/td>\n<\/tr>\n
Olvad\u00e1spont \u2103<\/td>\n54-56.5<\/td>\n<\/tr>\n
Neh\u00e9zf\u00e9m%<\/td>\n\u22640.001<\/td>\n<\/tr>\n
APHA<\/td>\n\u226410<\/td>\n<\/tr>\n
Hidrokinon dimetil\u00e9ter<\/td>\nNincs kijelentkezve<\/td>\n<\/tr>\n
Tartalom%<\/td>\n\u226599.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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4-Methoxyphenol Haszn\u00e1lat<\/strong><\/p>\n

1. F\u0151leg polimeriz\u00e1ci\u00f3s inhibitorokk\u00e9nt, ultraibolya-inhibitorokk\u00e9nt, vinilmonomerek fest\u00e9kk\u00f6zti term\u00e9keik\u00e9nt, valamint \u00e9lelmiszerzs\u00edrok \u00e9s kozmetikai antioxid\u00e1nsok, BHA szint\u00e9zis\u00e9hez haszn\u00e1lj\u00e1k.<\/p>\n

2. Ez egy fontos k\u00f6ztes term\u00e9k a finom k\u00e9miai term\u00e9kek, mint p\u00e9ld\u00e1ul a gy\u00f3gyszer, parf\u00fcm \u00e9s peszticid.Ez is haszn\u00e1lhat\u00f3 polimer inhibitor, \u00f6reged\u00e9sg\u00e1tl\u00f3 szer, l\u00e1gy\u00edt\u00f3szer \u00e9s \u00edgy tov\u00e1bb.F\u0151leg akrilnitril, akrilsav \u00e9s \u00e9szter\u00e9nek, metakrilsav \u00e9s \u00e9szter\u00e9nek \u00e9s m\u00e1s allyl monomerek polimeriz\u00e1ci\u00f3s inhibitorok el\u0151\u00e1ll\u00edt\u00e1s\u00e1ra haszn\u00e1lj\u00e1k.A legnagyobb el\u0151nye, hogy k\u00f6zvetlen\u00fcl r\u00e9szt vehet a polimeriz\u00e1ci\u00f3ban an\u00e9lk\u00fcl, hogy elt\u00e1vol\u00edtan\u00e1 a p-hidroxifenil-\u00e9tert, ha haszn\u00e1lj\u00e1k.Azt is haszn\u00e1lj\u00e1k, mint \u00f6reged\u00e9sg\u00e1tl\u00f3 szer, l\u00e1gy\u00edt\u00f3szer \u00e9s \u00e9lelmiszer-adal\u00e9kanyag (BHA) szint\u00e9zis.<\/p>\n

3. old\u00f3szerk\u00e9nt haszn\u00e1lj\u00e1k. Akrilsav \u00e9s akrilnitril monomer polimeriz\u00e1ci\u00f3s inhibitorok.Ultraibolya inhibitorok.Antioxid\u00e1nsok el\u0151\u00e1ll\u00edt\u00e1sa.Fest\u00e9kk\u00e9sz\u00edt\u00e9s.<\/p>\n

4. old\u00f3szerk\u00e9nt haszn\u00e1lj\u00e1k. A vinilmonomerek polimeriz\u00e1ci\u00f3s inhibitorak\u00e9nt;Ultraibolya-inhibitorok;Fest\u00e9kk\u00f6zvet\u00edt\u0151k \u00e9s az antioxid\u00e1ns BHA (3-tert-butil -4-hidroxifenil-\u00e9ter), amelyet \u00e9tolajok \u00e9s kozmetikumok szint\u00e9zis\u00e9hez haszn\u00e1lnak.A legnagyobb el\u0151nye, hogy a MEHQ-val hozz\u00e1adott monomert nem kell elt\u00e1vol\u00edtani m\u00e1s monomerekkel val\u00f3 kopolimeriz\u00e1ci\u00f3 sor\u00e1n, hanem k\u00f6zvetlen\u00fcl kopolimeriz\u00e1lhat\u00f3 ternerrel, \u00e9s \u00f6reged\u00e9sg\u00e1tl\u00f3k\u00e9nt \u00e9s antioxid\u00e1nsk\u00e9nt is haszn\u00e1lhat\u00f3.<\/p>\n

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4-Methoxyphenol Csomagol\u00e1s \u00e9s sz\u00e1ll\u00edt\u00e1s<\/strong><\/p>\n

Csomagol\u00e1s: 25kg\/karton dob<\/p>\n

Sz\u00e1ll\u00edt\u00e1s: tengeri vagy l\u00e9gi \u00faton<\/p>\n

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4-Methoxyphenol t\u00e1rol\u00e1sa<\/strong><\/p>\n

H\u0171v\u00f6s, sz\u00e1raz \u00e9s szell\u0151ztetett rakt\u00e1rban, oxid\u00e1l\u00f3szerekt\u0151l t\u00e1vol t\u00e1roljuk.<\/p>\n

L\u00e9pjen kapcsolatba vel\u00fcnk most!<\/b><\/strong><\/h2>\n

Ha \u00e1rra van sz\u00fcks\u00e9ge, k\u00e9rj\u00fck, t\u00f6ltse ki el\u00e9rhet\u0151s\u00e9g\u00e9t az al\u00e1bbi \u0171rlapon, \u00e1ltal\u00e1ban 24 \u00f3r\u00e1n bel\u00fcl felvessz\u00fck \u00d6nnel a kapcsolatot.<\/b><\/strong>\u00a0\u00d6n is k\u00fcldhet nekem e-mailt info@longchangchemical.com<\/a><\/span> munkaid\u0151ben ( 8:30-18:00 UTC+8 H.-Szombat ) vagy haszn\u00e1lja a weboldal \u00e9l\u0151 chatj\u00e9t, hogy azonnali v\u00e1laszt kapjon.<\/b><\/strong><\/h4>\n

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Dihidroxibenzol izomeriz\u00e1ci\u00f3ja<\/strong><\/h2>\n

A dihidroxibenzolok az arom\u00e1s vegy\u00fcletek olyan oszt\u00e1lya, amelynek benzolgy\u0171r\u0171j\u00e9hez k\u00e9t hidroxilcsoport (-OH) kapcsol\u00f3dik. Ezek a molekul\u00e1k fontos szerepet j\u00e1tszanak olyan ter\u00fcleteken, mint a gy\u00f3gyszeripar, az agrok\u00e9mia, az anyagtudom\u00e1ny \u00e9s a term\u00e9szetes term\u00e9kek szint\u00e9zise. P\u00e9ld\u00e1ul a katecholt (1,2-dihidroxi-benzol) bionikus ragaszt\u00f3kban, korr\u00f3zi\u00f3g\u00e1tl\u00f3kban \u00e9s gy\u00f3gyszerszint\u00e9zisben haszn\u00e1lj\u00e1k; a rezorcinolt (1,3-dihidroxi-benzol) tart\u00f3s\u00edt\u00f3szerk\u00e9nt haszn\u00e1lj\u00e1k a gy\u00f3gyszeriparban \u00e9s gyantak\u00e9nt a gumiiparban; a fenilfenolt (1,4-dihidroxi-benzol) pedig sz\u00e1mos alkalmaz\u00e1sban haszn\u00e1lj\u00e1k, p\u00e9ld\u00e1ul a f\u00e9nyk\u00e9p\u00e9szetben, kozmetikumokban \u00e9s polimeriz\u00e1ci\u00f3s inhibitork\u00e9nt. A dihidroxibenzol ir\u00e1nti glob\u00e1lis \u00e9ves kereslet meghaladja a 200 000 tonn\u00e1t. A hagyom\u00e1nyos ipari gy\u00e1rt\u00e1si folyamatok azonban bonyolultak, nehezen elk\u00fcl\u00f6n\u00edthet\u0151k \u00e9s kev\u00e9sb\u00e9 szelekt\u00edvek a c\u00e9lterm\u00e9kek tekintet\u00e9ben. P\u00e9ld\u00e1ul a katechol \u00e9s a hidrokinon ipari szint\u00e9zis\u00e9nek \u00fatja a fenol hidroxil\u00e1l\u00e1sa hidrog\u00e9n-peroxiddal, savas vagy zeolit kataliz\u00e1torok \u00e1ltal kataliz\u00e1lva (1. \u00e1bra). Ez a folyamat nagy fenol\/hidrog\u00e9n-peroxid ar\u00e1nyt ig\u00e9nyel (~20) a fenol t\u00falzott t\u00faloxid\u00e1l\u00f3d\u00e1s\u00e1nak elker\u00fcl\u00e9se \u00e9rdek\u00e9ben. Az ezen az elj\u00e1r\u00e1si \u00faton nyert dihidroxibenzol azonban \u00e1ltal\u00e1ban kev\u00e9sb\u00e9 szelekt\u00edv, \u00e9s a hidrokinon hozama sokkal magasabb, mint a magas hozz\u00e1adott \u00e9rt\u00e9k\u0171 katecholok\u00e9 (katecholok\u00e9). Ennek f\u0151 okai a k\u00f6vetkez\u0151k: 1) Mivel a fenol k\u00f6nnyen t\u00faloxid\u00e1l\u00f3dik savak \u00e9s polimerek k\u00e9pz\u0151d\u00e9s\u00e9hez, ez viszonylag alacsony dihidroxibenzol-szelektivit\u00e1shoz vezet. 2) A fenol hidroxilez\u00e9se kev\u00e9sb\u00e9 regioszelekt\u00edv, \u00e9s a term\u00e9k t\u00f6bb hidrokinont tartalmaz, mint a nagy \u00e9rt\u00e9k\u0171 katekol. E probl\u00e9m\u00e1k megold\u00e1s\u00e1nak kulcsa abban rejlik, hogy megtal\u00e1ljuk a m\u00f3dj\u00e1t a dihidroxibenzol szelekt\u00edv \u00e1talak\u00edt\u00e1s\u00e1nak egy m\u00e1sik izomerr\u00e9, ez\u00e1ltal kezelve a term\u00e9kszelektivit\u00e1s \u00e9s a t\u00faltermel\u00e9s kih\u00edv\u00e1sait. P\u00e9ld\u00e1ul a xilolok izomeriz\u00e1ci\u00f3ja ZSM-5 zeolitokban \u00fagy val\u00f3s\u00edthat\u00f3 meg, hogy a kev\u00e9sb\u00e9 haszn\u00e1lt m- \u00e9s o-xilolokat paraxil\u00e9nn\u00e9 alak\u00edtj\u00e1k \u00e1t, hogy kiel\u00e9g\u00edts\u00e9k a poli\u00e9szter prekurzork\u00e9nt jelentkez\u0151 ig\u00e9nyt. A k\u00f6vetkez\u0151kben besz\u00e1molunk a dihidroxibenzol izomeriz\u00e1ci\u00f3j\u00e1r\u00f3l Pt\/ZSM-5 kataliz\u00e1torokon hidrog\u00e9n atmoszf\u00e9r\u00e1ban, v\u00edzzel mint old\u00f3szerrel 400 \u00b0C-on. Az optimaliz\u00e1lt kataliz\u00e1tor lehet\u0151v\u00e9 tette a hidrokinon katekoll\u00e1 t\u00f6rt\u00e9n\u0151 izomeriz\u00e1ci\u00f3j\u00e1t 74% szelektivit\u00e1ssal \u00e9s ak\u00e1r 50% hozammal. Mechanisztikus vizsg\u00e1latok kimutatt\u00e1k, hogy az izomeriz\u00e1ci\u00f3s reakci\u00f3ban kulcsszerepet j\u00e1tszik a k\u00f6ztes sz\u00e9ntartalm\u00fa lerak\u00f3d\u00e1s (koksz).<\/p>\n

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A dihidroxibenzolok izomeriz\u00e1ci\u00f3s tulajdons\u00e1gai<\/p>\n

Dihidroxibenzolok izomeriz\u00e1ci\u00f3j\u00e1t v\u00e9gezt\u00e9k fix\u00e1gyas reaktorban H-ZSM-5 zeolitok felhaszn\u00e1l\u00e1s\u00e1val Pt-vel \u00e9s an\u00e9lk\u00fcl. A katekolt, hidrokinont vagy rezorcinolt v\u00edzben oldott\u00e1k, \u00e9s hidrog\u00e9n\u00e1ramban, 400 \u00b0C-on a kataliz\u00e1torr\u00e9teghez vezett\u00e9k, majd a reaktor kimenet\u00e9n\u00e9l l\u00e9v\u0151 foly\u00e9kony term\u00e9ket elemezt\u00e9k. A reakci\u00f3 f\u0151 term\u00e9kei a reag\u00e1lt dihidroxibenzolt\u00f3l f\u00fcgg\u0151en a katechol \u00e9s a hidrokinon mint izomeriz\u00e1ci\u00f3s term\u00e9kek, valamint a fenol mint dehidroxil\u00e1ci\u00f3s term\u00e9k voltak (2a. \u00e1bra, S1. \u00e1bra, SI). A kataliz\u00e1tor aktivit\u00e1sa a kezdeti szakaszban magas volt, de id\u0151vel fokozatosan cs\u00f6kkent az akt\u00edv helyek deaktiv\u00e1l\u00f3d\u00e1sa miatt (2d. \u00e1bra, S2. \u00e1bra, SI). A katechol izomeriz\u00e1ci\u00f3j\u00e1nak id\u0151beli elemz\u00e9se 0,2% Pt\/ZSM-5(30)-on azt mutatta, hogy a fenol \u00e9s a hidrokinon szelektivit\u00e1sa a kezdeti f\u00e1zisban 15%-n\u00e9l hasonl\u00f3 volt. A folyad\u00e9kf\u00e1zis\u00fa term\u00e9k alacsony szelektivit\u00e1sa a kataliz\u00e1tor fel\u00fclet\u00e9n a reakci\u00f3 mell\u00e9kterm\u00e9kek\u00e9nt keletkez\u0151 nagy mennyis\u00e9g\u0171 sz\u00e9n-dioxid lerak\u00f3d\u00e1snak k\u00f6sz\u00f6nhet\u0151, amely megakad\u00e1lyozza, hogy a 2. \u00e1br\u00e1n l\u00e1that\u00f3 szelektivit\u00e1s el\u00e9rje az 100% \u00e9rt\u00e9ket. Ez magyar\u00e1zza a kataliz\u00e1tor deaktiv\u00e1l\u00f3d\u00e1s\u00e1t is a sz\u00e9ntartalm\u00fa anyag lerak\u00f3d\u00e1sa miatt. Az aktivit\u00e1s a reakci\u00f3 sor\u00e1n gyorsan cs\u00f6kken, \u00e9s k\u00f6r\u00fclbel\u00fcl 20 \u00f3ra eltelt\u00e9vel \u00e9ri el a stabil katalitikus teljes\u00edtm\u00e9nyt. A hidrokinon szelektivit\u00e1sa az id\u0151 m\u00fal\u00e1s\u00e1val t\u00f6bb mint 50%-re n\u0151tt a katechol kokszal val\u00f3 kondenz\u00e1ci\u00f3j\u00e1nak cs\u00f6kken\u00e9se miatt. A tiszta ZSM-5 szinte semmilyen izomeriz\u00e1ci\u00f3s aktivit\u00e1st nem mutatott a katecholra (2b. \u00e1bra) A Pt-m\u00f3dos\u00edtott amorf alum\u00ednium-szilik\u00e1tok csak nyomokban adtak hidrokinont, a reakci\u00f3 f\u0151 term\u00e9ke a fenol volt, ami arra utal, hogy a Pt-nak kulcsszerepe van a katechol fenoll\u00e1 t\u00f6rt\u00e9n\u0151 hidrogenol\u00edzis\u00e9ben. Az amorf alum\u00ednium-szilik\u00e1tok alacsony savass\u00e1ga a kataliz\u00e1torok alacsony izomeriz\u00e1ci\u00f3s aktivit\u00e1s\u00e1t eredm\u00e9nyezte. A munka tov\u00e1bb\u00e1 a f\u00e9m \u00e9s a sav funkcionalit\u00e1s hat\u00e1s\u00e1nak elemz\u00e9s\u00e9re \u00f6sszpontos\u00edtott a Pt\/ZSM-5 katalitikus teljes\u00edtm\u00e9ny\u00e9re a reakci\u00f3ban a Pt mennyis\u00e9g\u00e9nek, illetve a SiO2\/Al2O3 ar\u00e1ny\u00e1nak v\u00e1ltoztat\u00e1s\u00e1val.<\/p>\n

 <\/p>\n

Sz\u00e9nalap\u00fa polimerrel seg\u00edtett izomeriz\u00e1ci\u00f3s mechanizmus<\/p>\n

A dihidroxibenzol izomeriz\u00e1ci\u00f3j\u00e1t fix\u00e1gyas reaktorban v\u00e9gezt\u00e9k H-ZSM-5 zeolitok felhaszn\u00e1l\u00e1s\u00e1val Pt-vel \u00e9s an\u00e9lk\u00fcl. A katekolt, hidrokinont vagy rezorcinolt v\u00edzben oldott\u00e1k, \u00e9s hidrog\u00e9n\u00e1ramban, 400 \u00b0C-on a kataliz\u00e1torr\u00e9teghez vezett\u00e9k, majd a reaktor kimenet\u00e9n\u00e9l l\u00e9v\u0151 foly\u00e9kony term\u00e9ket elemezt\u00e9k. A reakci\u00f3 f\u0151 term\u00e9kei a reag\u00e1lt dihidroxibenzolt\u00f3l f\u00fcgg\u0151en a katechol \u00e9s a hidrokinon izomeriz\u00e1ci\u00f3s term\u00e9kk\u00e9nt, valamint a fenol dehidroxil\u00e1ci\u00f3s term\u00e9kk\u00e9nt (2a. \u00e1bra, S1. \u00e1bra, SI). A kataliz\u00e1tor aktivit\u00e1sa a kezdeti szakaszban magas volt, de id\u0151vel fokozatosan cs\u00f6kkent az akt\u00edv helyek deaktiv\u00e1l\u00f3d\u00e1sa miatt (2d. \u00e1bra, S2. \u00e1bra, SI). A katechol izomeriz\u00e1ci\u00f3j\u00e1nak elemz\u00e9se 0,2% Pt\/ZSM-5(30)-on az id\u0151 m\u00fal\u00e1s\u00e1val hasonl\u00f3 15% szelektivit\u00e1st mutatott a fenol \u00e9s a hidrokinon eset\u00e9ben a kezdeti f\u00e1zisban. A folyad\u00e9kf\u00e1zis\u00fa term\u00e9k alacsony szelektivit\u00e1sa a kataliz\u00e1tor fel\u00fclet\u00e9n a reakci\u00f3 mell\u00e9kterm\u00e9kek\u00e9nt keletkez\u0151 nagy mennyis\u00e9g\u0171 sz\u00e9n-dioxid lerak\u00f3d\u00e1snak k\u00f6sz\u00f6nhet\u0151, amely megakad\u00e1lyozza, hogy a 2. \u00e1br\u00e1n l\u00e1that\u00f3 szelektivit\u00e1s el\u00e9rje az 100% \u00e9rt\u00e9ket. Ez magyar\u00e1zza a kataliz\u00e1tor deaktiv\u00e1l\u00f3d\u00e1s\u00e1t is a sz\u00e9ntartalm\u00fa anyag lerak\u00f3d\u00e1sa miatt. Az aktivit\u00e1s a reakci\u00f3 sor\u00e1n gyorsan cs\u00f6kken, \u00e9s k\u00f6r\u00fclbel\u00fcl 20 \u00f3ra eltelt\u00e9vel \u00e9ri el a stabil katalitikus teljes\u00edtm\u00e9nyt. A hidrokinon szelektivit\u00e1sa az id\u0151 m\u00fal\u00e1s\u00e1val t\u00f6bb mint 50%-re n\u0151tt a katechol kokszal val\u00f3 kondenz\u00e1ci\u00f3j\u00e1nak cs\u00f6kken\u00e9se miatt. A tiszta ZSM-5 szinte semmilyen izomeriz\u00e1ci\u00f3s aktivit\u00e1st nem mutatott a katecholra (2b. \u00e1bra) A Pt-m\u00f3dos\u00edtott amorf alum\u00ednium-szilik\u00e1tok csak nyomokban adtak hidrokinont, a reakci\u00f3 f\u0151 term\u00e9ke a fenol volt, ami arra utal, hogy a Pt-nak kulcsszerepe van a katechol fenoll\u00e1 t\u00f6rt\u00e9n\u0151 hidrogenol\u00edzis\u00e9ben. Az amorf alum\u00ednium-szilik\u00e1tok alacsony savass\u00e1ga a kataliz\u00e1torok alacsony izomeriz\u00e1ci\u00f3s aktivit\u00e1s\u00e1t eredm\u00e9nyezte. A munka tov\u00e1bb\u00e1 a f\u00e9m \u00e9s a sav funkcionalit\u00e1s hat\u00e1s\u00e1nak elemz\u00e9s\u00e9re \u00f6sszpontos\u00edtott a Pt\/ZSM-5 katalitikus teljes\u00edtm\u00e9ny\u00e9re a reakci\u00f3ban a Pt mennyis\u00e9g\u00e9nek, illetve a SiO2\/Al2O3 ar\u00e1ny\u00e1nak v\u00e1ltoztat\u00e1s\u00e1val. Az a t\u00e9ny, hogy a dihidroxibenzol jelent\u0151s kondenz\u00e1ci\u00f3n megy kereszt\u00fcl a kataliz\u00e1tor fel\u00fclet\u00e9n, \u00e9s sz\u00e9ntartalm\u00fa lerak\u00f3d\u00e1sok keletkeznek, arra utal, hogy az izomeriz\u00e1ci\u00f3 egy intermolekul\u00e1ris mechanizmuson kereszt\u00fcl t\u00f6rt\u00e9nhet, amelyben a dihidroxibenzol k\u00f6zbens\u0151 polimeriz\u00e1l\u00f3dik, majd depolimeriz\u00e1l\u00f3dik \u00e9s izomereket termel. Annak a hipot\u00e9zisnek a tesztel\u00e9s\u00e9re, hogy a polimer anyagok k\u00f6ztes anyagk\u00e9nt m\u0171k\u00f6dnek, a mosott, deaktiv\u00e1lt kataliz\u00e1torokat 400\u00b0C-on v\u00edzg\u0151z \u00e9s hidrog\u00e9n \u00e1ram\u00e1ban kezelt\u00fck. Meglep\u0151 m\u00f3don a folyad\u00e9kmint\u00e1ban a katechol mellett jelent\u0151s mennyis\u00e9g\u0171 hidrokinont is kimutattunk, a fenol kisebb m\u00e9rt\u00e9kben j\u00e1rult hozz\u00e1 (3. \u00e1bra). A term\u00e9k k\u00e9pz\u0151d\u00e9se 3 \u00f3ra kezel\u00e9s ut\u00e1n le\u00e1llt. A kataliz\u00e1tor e kezel\u00e9s ut\u00e1n a m\u00e1sodik ciklusra regener\u00e1l\u00f3dott katalitikus aktivit\u00e1st mutatott (3. \u00e1bra).<\/p>\n

 <\/p>\n

Megl\u00e1t\u00e1sok \u00e9s perspekt\u00edv\u00e1k<\/p>\n

Bemutatjuk a dihidroxibenzol k\u00f6zvetlen izomeriz\u00e1ci\u00f3j\u00e1t a fenol-hidroxil\u00e1ci\u00f3s term\u00e9kek (katechol \u00e9s hidrokinon) egym\u00e1sba t\u00f6rt\u00e9n\u0151 \u00e1talak\u00edt\u00e1sa \u00e9rdek\u00e9ben. A katalitikus eredm\u00e9nyek azt mutatt\u00e1k, hogy a katechol \u00e9s a hidrokinon sikeresen \u00e9s reverzibilisen \u00e1talakult Pt\/ZSM-5 kataliz\u00e1toron. A reakci\u00f3 szelektivit\u00e1sa 74%, a hozam pedig 50% volt. A reakci\u00f3t hidrog\u00e9n atmoszf\u00e9r\u00e1ban, v\u00edzg\u0151zben 400\u00b0C-on hidrog\u00e9nk\u00f6lcs\u00f6nz\u00e9si mechanizmuson kereszt\u00fcl hajtott\u00e1k v\u00e9gre, az aktivit\u00e1s az id\u0151 m\u00fal\u00e1s\u00e1val cs\u00f6kkent a sz\u00e9n-dioxid lerak\u00f3d\u00e1sok k\u00e9pz\u0151d\u00e9se miatt, amelyek a dihidroxibenzol kinonn\u00e1 t\u00f6rt\u00e9n\u0151 dehidrog\u00e9nez\u00e9s\u00e9vel \u00e9s az azt k\u00f6vet\u0151 kondenz\u00e1ci\u00f3val keletkeztek a savas helyeken. Ezek a sz\u00e9ntartalm\u00fa lerak\u00f3d\u00e1sok hidrog\u00e9n- \u00e9s v\u00edz\u00e1ramban t\u00f6rt\u00e9n\u0151 kezel\u00e9ssel izomeriz\u00e1lt dihidroxibenzoll\u00e1 alak\u00edthat\u00f3k, ami meger\u0151s\u00edti ezen anyagok szerep\u00e9t a reakci\u00f3ban. Ez a mechanizmus \u00faj betekint\u00e9st ny\u00fajt az izomeriz\u00e1ci\u00f3s folyamatba.<\/p>","protected":false},"excerpt":{"rendered":"

K\u00e9miai n\u00e9v: 4-metoxifenol<\/p>\n

CAS-sz\u00e1m: 150-76-5<\/p>\n

Molekul\u00e1ris k\u00e9plet:C7H8O2<\/p>\n

Molekulat\u00f6meg:124,14<\/p>\n

Molekulaszerkezet:\"4-Methoxi-fenol<\/p>\n

Megjelen\u00e9s: Feh\u00e9r krist\u00e1lyos pehely<\/p>","protected":false},"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[69],"product_tag":[],"class_list":{"0":"post-4026","1":"product","2":"type-product","3":"status-publish","5":"product_cat-catalysts-chemical-auxiliary-agents","7":"first","8":"instock","9":"shipping-taxable","10":"product-type-simple"},"yoast_head":"\nChina Hydroquinone \/ 4-Methoxyphenol CAS 150-76-5 Manufacturer - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"Hydroquinone \/ 4-Methoxyphenol CAS 150-76-5 is a key product of Longchang Chemical. We provide the best price. 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