New technological process of synthesizing acetyl bromide, acetic acid, acetate from methane

Abstract

The invention discloses a novel process for preparing acetyl bromide, acetic acid and acetic ester from methane, which consists of reacting methane, oxygen and aqueous solution of HBr to obtain CH3Br and CO through catalytic reaction, then subjecting CH3Br and CO to carbonation reaction so as to prepare acetyl bromide in organic medium containing catalyst, then directly hydrolyzing the acetyl bromide and a certain amount of water into acetic acid, and reacting acetyl bromide and alcohols to obtain the acetic esters of the corresponding alcohols. The HBr can be regenerated as circular reaction medium and used again for the reaction for preparing CH3Br and CO from methane. The organic medium of the carbonylation reaction contains catalyst such as rhodium (Rh) compound, hydriodate and / or organo-phosphorus ligand, and a certain proportion of solvents.

Description

Technical field [0001] The present invention relates to a new process for preparing acetyl bromide, acetic acid, and acetate from methane. It is an extension of the Chinese invention patent with application number 200410022850.8 and involves further research results. Background technique [0002] Acetic acid and acetate are both important chemical raw materials, used in the chemical industry in large quantities, and are important industrial chemicals. At present, the acetic acid process mainly uses natural gas or coal as raw materials to produce synthesis gas through steam reforming, and then the synthesis gas is used to catalyze the synthesis of methanol. Methanol and CO are used in catalysts such as NiCl. 2 , CoCl 2 , RuCl 3 Or RhCl 3 Acetic acid is generated under the action of the carbonyl compound. The disadvantage of this method is that synthesis gas must be prepared first, then methanol can be synthesized, and finally acetic acid can be synthesized. The process of preparin...

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Problems solved by technology

[0006] U.S. Patent No. 6,452,058 (2002) discloses a method for preparing acetic acid from methane. This method is carried out in three steps. The first step is to generate CH from methane, HCl, and oxygen under the action of a rare earth oxyhalide catalyst. 3 Cl, CH 2 Cl 2 , the conversion rate of methane is 12%, and the generation of CH 3 Cl, CH 2 Cl 2 The selectivities are respectively 71% and 16%, generating target product CH1 3 The yield of Cl is not high (8.5%), and CH 2 Cl 2 Cannot be used; the inventor only claims to use the generated CH 3 Cl and CO generate CH under the action of catalyst 3 COCl, but there is no experimental result; the third step is to hydrolyze CH 3 COCl produces acetic acid (also only declared, but no experimental results

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