RO83332B1

RO83332B1 - Process for preparing 2, 2-bis-(4-hydroxy-phenyl)-propane

Info

Publication number: RO83332B1
Application number: RO105374A
Authority: RO
Inventors: Claudiu Gheorghe; Ioan Sfintescu; Ioan Anton; Zamfir Stancu; Valentin Anastasiu; Nicolae Tonoiu; Traian Mihai; Danut Taralunga; Apostol Gradinaru; Vasile Dascalu; Margareta Bancila; Adrian Cosaveanu; Elena Catana; Ioana Mateescu; Luminita Stoica; Cristina Bazu; Erna Calman; Justin Herscovici
Original assignee: Institutul De Cercetari Chimice
Priority date: 1981-09-23
Filing date: 1981-09-23
Publication date: 1984-04-30
Also published as: RO83332A3

Abstract

Inventia de fata se refera la un procedeu pentru prepararea 2,2-bis-(4-hidroxi-fenil)-propanului, prin reactia, într-o singura trapta, dintre fenol si acetona în prezenta de catalizatori acizi si promotori de compusi organici cu sulf, cu recuperarea reactantilor nereactionati si purificarea produsului brut, conform inventiei principale, cu descrierea nr. 65066 si a inventiei complementare, cu descrierea nr. 65618, prin care, în scopul îmbunatatirii randamentului de reactie într-un raport de recirculare de 50: 1 fata de debitul de alimentare cu materii prime, cantitatea de apa admisa în reactantii recirculati fiind de pîna la 2% g, se îndeparteaza fractiunile usoare prin distilare în vid la o presiune de maximum 250 mm Hg si la o temperatura maxima de 150 degree C, se separa prin distilare din fractiunile usoare, acetona si promotorul de apele folosite la maximum 600 mm Hg cu recircularea acestora la sinteza, apele fenolice fiind defenolate prin extractie cu o hidrocarbura aromatica în raport gravimetric de 1:2...5, la temperaturi de 35...60 degree C, apoi se îndeparteaza prin evaporare majoritatea fenolului din produsul de reactie pîna la maximum 10% g, la temperaturi pîna la 175 degree C si presiune de maximum 100 mm Hg, restul de fenol îndepartîndu-se prin dizolvare într-o hidrocarbura aromatica si/sau clorurata, la temperatura de 10...40 degree C.....The present invention relates to a process for preparing 2,2-bis- (4-hydroxy-phenyl) -propane by reacting in a single trap between phenol and acetone in the presence of acid catalysts and promoters of organic compounds with sulfur, with the recovery of unreacted reactants and purification of the crude product according to the main invention, 65066 and the complementary invention, with specification no. 65618, in which, in order to improve the reaction efficiency in a 50: 1 recirculation ratio relative to the raw material feed rate, the amount of water admitted in the recirculated reactants being up to 2% g, the light fractions are removed by vacuum distillation at a pressure not exceeding 250 mm Hg and at a maximum temperature of 150 ° C, distilling off from the light fractions, acetone and the water promoter used up to a maximum of 600 mm Hg with their recirculation to the synthesis, the phenolic waters being defenated by extraction with an aromatic hydrocarbon in a gravimetric ratio of 1: 2 ... 5 at temperatures of 35 ... 60 ° C, then evaporating most of the phenol in the reaction product up to a maximum of 10% g at temperatures up to at 175 ° C and pressure of maximum 100 mm Hg, the remainder of the phenol being dissolved by dissolving in an aromatic and / or chlorinated hydrocarbon at 10 ... 40 ° C .....