摘要:
The invention relates to an intermediate product based on the organic carbonates and carbamates mixture and method for the production thereof. The inventive method consists in reacting a carbamide, a substituted carbamide, a carbamic acid salt or ester or one of the N-substituted derivatives thereof in a glycol polyalkylene, polyol polyester or a polyol polyether of general formula (I), wherein R is a linear or branched alkylene group having from 2 to 12 carbon atoms and n is a number ranging from 1 to 20, or in a totally or partly hydrolysed polyvinyl alcohol of general formula (II), wherein R′ is an alkyl, aryl or acyl group having from 1 to 12 carbon atoms p and q are numbers ranging from 1 to 20, or dissolving in the mixture of said compounds with an alkaline catalyst promoting the ammonia separation. The thus free ammonia or an amine produced by the reaction mixture is removed by a stripping gas.
摘要:
The invention relates to a method for the production of monomer organic carbonates, wherein urea, substituted urea, a salt or an ester of carbamide acid or one of the N-substituted derivatives thereof is reacted in a first step in a polyalkylene glycol, a polyester-polyol or a polyether-polyol of general formula (I), wherein R represents a linear or branched alkylene group having 2-12 carbon atoms and n is a number between (2) and (20), or in a completely or partially hydrolysed polyvinyl alcohol of general formula (II) wherein R′ represents an alkyl group, an aryl group or an acyl group having 1-12 carbon atoms, p and q are numbers between 1 and 20, or in mixtures of said compounds in the presence of a catalyst facilitating the separation of ammonia in order to form a mixture containing carbonates and carbamates, the ammonia becomes free or the amine is removed form the reaction mixture by means of a strip gas. In a second reaction step (transesterification), the mixture containing the carbonates and carbamates is reacted with a monomer alcohol or a phenol whereby monomer carbonates are formed and polymer polyalcohols of formulae (I) or (II) are reformed. HO—RnOH (I)
摘要翻译:本发明涉及一种制备单体有机碳酸酯的方法,其中脲,取代的脲,脲或其中的一种或多种N-取代的衍生物的脲或其酯之一在第一步骤中在聚亚烷基二醇,聚酯 - 多元醇或通式(I)的聚醚多元醇,其中R表示具有2-12个碳原子的直链或支链亚烷基,n是(2)和(20)之间的数,或者在完全或部分水解的 通式(II)的聚乙烯醇,其中R'表示烷基,芳基或具有1-12个碳原子的酰基,p和q是1至20之间的数字,或所述化合物在存在下的 促进氨分离以形成含有碳酸酯和氨基甲酸酯的混合物的催化剂,氨变得游离,或者通过带状气体从反应混合物中除去胺。 在第二反应步骤(酯交换)中,将含有碳酸酯和氨基甲酸酯的混合物与单体醇或苯酚反应,由此形成单体碳酸酯,并且将式(I)或(II)的聚合物多元醇重整。 <?in-line-formula description =“In-line Formulas”end =“lead”?> H OR SUB> OH(I)<?in-line-formula description =“In-line Formulas”end =“tail”?>
摘要:
The invention relates to a method for the production of monomer organic carbonates from a mixture of organic carbonates and carbamates which are obtained by reacting urea, substituted urea, a salt or ester of carbamide acid or one of the N-substituted derivatives thereof with a polyalkylene glycol, polyester-polyol or a polyether-polyol of general formula (I), wherein R represents a linear or branched alkylene group having 2-12 carbon atoms and n represents a number between 2 and 20, or with a completely or partially hydrolysed polyvinyl alcohol of general formula (II), wherein R′ represents an alkyl group, an aryl group or an acyl group having 1-12 carbon atoms, p and q represent a number between 120, or with mixtures of said compounds in the presence of a catalyst facilitating the separation of ammonia and the ammonia becomes free or the amine is removed from the reaction mixture by means of a strip gas, whereby said mixture is reacted m with an alcohol or a phenol whereby monomer carbonates are formed and polymer polyalcohols of formulae (I) or (II) are reformed.
摘要:
The present invention relates to a process for the preparation of nanocrystalline hydrotalcite compounds comprising the steps: introduction of one or more starting compounds into a reaction chamber by means of a carrier fluid, subjecting the starting compound(s) in a treatment zone to a pulsating thermal treatment at a temperature of 250 to 400° C., formation of nanocrystalline metal-oxide particles, discharging of the nanocrystalline hydrotalcite particles from the reactor, wherein the starting compound(s) are introduced into the reaction chamber in the form of a solution, slurry, suspension or in solid aggregate state, and a nanocrystalline hydrotalcite material obtainable by the process according to the invention and its use as an adsorption and catalyst material.
摘要:
A method for the production of a nanocrystalline bismuth-molybdenum mixed oxide, the use of the bismuth-molybdenum mixed oxide as catalyst for chemical conversions, in particular for a conversion of propylene to acrolein and/or acrylic acid or of isobutylene to methacrolein and/or methacrylic acid, as well as a catalyst that contains the bismuth-molybdenum mixed oxide.