Abstract:
비스페놀-A 제조 시 사용된 페놀/아세톤 정제 공정을 활용하여 경제성 및 효율성을 향상시킬 수 있는, 비스페놀-A 잔사물 분해 반응 생성물로부터 페놀 및 아세톤을 회수하기 위한 방법이 개시된다. 상기 비스페놀-A 잔사물 분해 반응 생성물로부터 페놀 및 아세톤을 회수하기 위한 방법은, (a) 큐멘의 산화 반응에 의해 제조된 큐멘 하이드로 퍼옥사이드를 분해 및 정제하여, 페놀 및 아세톤을 분리하는 단계; (b) 상기 분리된 페놀 및 아세톤을 반응시켜 제조된 비스페놀-A를 분리하고, 분리되지 않은 비스페놀-A를 포함하는 퍼지(purge) 스트림 또는 페놀의 일부 또는 전체가 배출 및 회수됨으로써 더욱 농축된 퍼지 스트림을 알칼리 수용액 하에서 분해하는 단계; 및 (C) 상기 분해 반응에 의한 반응 생성물을, 상기 페놀 및 아세톤을 분리하는 공정에 공급하여, 페놀 및 아세톤을 분리하는 단계;를 포함하며, 상기 (a) 단계와 (C) 단계는 동시에 수행되는 것을 특징으로 한다.
Abstract:
Disclosed are novel cyclohexanone compositions, and processes for making such cyclohexanone compositions, from a mixture comprising phenol, cyclohexanone, and cyclohexylbenzene. Such cyclohexanone compositions comprise at least 99 wt% cyclohexanone, at most 0.15 wt% water, and at most 500 wppm combined of certain cyclohexanone impurities selected from the group consisting of: benzene, cyclohexene, pentanal, cyclopentanol, cyclohexanol, and phenol.
Abstract:
A method of producing phenol and acetone can comprise: alkylating benzene with a C2-6 alkyl source in the presence of a zeolite catalyst to produce a C8-12 alkylbenzene; oxidizing the C8-12 alkylbenzene in the presence of an oxygen containing gas to produce a C8-12 alkylbenzene hydroperoxide; cleaving decomposing the C8-12 alkylbenzene hydroperoxide in the presence of an acid catalyst to produce phenol, a C3-6 ketone, and undesirable side products such as, but not limited to acetaldehyde, DMBA, acetophenone, AMS, AMS dimers, unidentified heavies, or a combination comprising at least one of the foregoing; and monitoring a concentration of the C8-12 alkylbenzene hydroperoxide in a process stream of a reactor in real time at a temperature and a pressure of the process stream; and in real time, controlling a parameter of the reactor and/or the cleaving decomposing in response to the concentration of the C8-12 alkylbenzene hydroperoxide.
Abstract:
Disclosed is a hydroalkylation process in which the hydroalkylation catalyst is activated in the presence of a flowing fluid comprising hydrogen and a condensable agent. The presence of the condensable agent enables fast, effective activation of the hydroalkylation catalyst precursor in a cost-effective manner. It also yields superior catalyst performance.
Abstract:
The invention relates to a new catalytic composition for the alkylation of aromatic compounds with alcohols, or mixtures of alcohols and corresponding olefins, wherein said composition comprises a zeolite of the MTW type and is characterized in that it contains one or more alkaline metals in a total quantity which is less than or equal to 0.02% by weight. The use of said catalyst in the alkylation of aromatic compounds with alcohols, in particular benzene with isopropanol or ethanol, allows the formation, as by-product, of the aldehyde or ketone corresponding to the alcohol used, to be minimized: the formation of reaction by-products of said aldehydes or ketones having a boiling point very close to that of polyalkylation products, is therefore significantly reduced. This provides a considerable advantage in the subsequent transalkylation step for the recovery of said polyalkylates by transformation into the corresponding monoalkylates.
Abstract:
The present invention relates to a process for the preparation of phenol/acetone mixture from cumene. The invention thus aims a process for the production of phenol/acetone mixture from cumene, via cumene hydroperoxide (CHP), which comprises the following steps: a. oxidation of cumene with a gas containing oxygen to produce CHP, b. concentration of the solution containing CHP obtained from step a. by evaporation, to at least 70 percent by weight; c. production of phenol/acetone mixture by acid cleavage of CHP solution obtained from step b., in which step b. is carried out in a multiple effect evaporation system comprising at least 2 effects.
Abstract:
Disclosed herein is a process for dehydrogenating a hydrocarbon with a dehydrogenation catalyst comprising a step of activating the catalyst precursor in a H 2- containing atmosphere. A particularly advantageous activation process includes heating the catalyst precursor to a temperature in a range from 400°C to 600°C. The process of the present disclosure is particularly advantageous for dehydrogenating cyclohexane to make benzene.
Abstract:
In a process for producing cumene, isopropanol containing nitrogenous impurities is reacted with benzene in an alkylation reactor to produce an effluent stream comprising cumene, unreacted benzene and water. Water is removed from the effluent stream and an aliquot of the resultant dried effluent stream is treated to remove nitrogenous impurities and produce a purified recycle stream. At least part of the purified recycle stream is then recycled to the alkylation reactor. In an alternative embodiment, the isopropanol is combined with fresh and/or recycled benzene and the combined stream is treated to remove nitrogenous impurities before being fed to the alkylation reactor.
Abstract:
Disclosed herein are catalyst compositions useful in selective decomposition of organic oxygenates. A feed comprising an organic oxygenate may be contacted with a catalyst comprising (a) at least 0.1 wt% of an oxide of an element selected from Group 3 of the Periodic Table of Elements, wherein Group 3 includes the Lanthanide series; (b) at least 0.1 wt% of an oxide of an element selected trom Group 6 of the Periodic Table of Elements; and (c) at least 0.1 wt.% of an oxide of at least one element selected from Group 4 of the Periodic Table of Elements, wherein the wt%s are based upon the total combined weight of the oxides in (a) through (c) and excludes any other components.