Novel flow chart for preparing acetic acid, methanol and dimethyl ether from methane by non synthetic gas process

Abstract

The new process of synthesizing acetic acid with methane consists of two reaction steps, including the first step of reacting methane, oxygen and hydrogen bromide or hydrobromic acid on catalyst to produce CH3Br, CO and H2O; and the second step of reacting CH3Br, CO and H2O on catalyst to prepare acetic acid. During the reaction of synthesizing methanol and dimethyl ether, the first step of oxybromizing reaction may have the reacting gas composition regulated and different catalyst adopted to reach the aim of creating CH3Br and H2O in high selectivity; and methanol and dimethyl ether may be then produced through hydrolysis on one other kind of catalyst. In the process of preparing acetic acid or methanol and dimethyl ether, HBr as the circular reaction medium is regenerated and returned to the reactor for reuse.

Description

Technical field: [0001] Synthesis of Acetic Acid, Methanol and Dimethyl Ether Background technique: [0002] 1. Synthesis of acetic acid [0003] Acetic acid is an organic acid and an important industrial raw material, mainly used in the production of vinyl acetate, cellulose acetate, and acetic anhydride. The current production method of acetic acid is: using natural gas or coal as raw material to prepare synthesis gas through steam reforming, and then catalytically synthesizing methanol from the synthesis gas. After methanol synthesis, methanol and CO in catalysts such as NiCl 2 、CoCl 2 、RuCl 3 or RhCl 3 Acetic acid is produced under the action of carbonyl compounds. [0004] The process developed by early BASF (J.Falbe, Carbon Monoxide in Organic Synthesis, Springer-Verlag, Berlin, 1970; P.Ellwood, Chem.Eng., 148 (May 19, 1969)) uses Co carbonyl compounds and iodine compounds as Catalyst to synthesize acetic acid at 210℃ / 700atm. Monsanto (F.E. Paulik, U.S. Patent ...

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Problems solved by technology

This process also uses syngas as raw material, which is a high energy consumption process