Copyright © 2020 Elsevier B.V. or its licensors or contributors. The vapor is then fed to a first sidedraw column where methyl acetate and its azeotropes and the intermediate boiling compounds are taken overhead, while acetic acid and water are collected as bottoms from the column and are returned to the reactor/column. 16. The reactor/column is commonly operated at a pressure in the reaction section of about 100 to 200 kPa (1 to 2 atmospheres). A second temperature feedback loop is used to vary the MeOH feed typically within about ±10% of its target rate for a given production rate during stoichiometric operation. The flow of liquid from the inlet sump is designated by arrows 49. Preferably, the residence time in the reactor is about 2.4 hours. The optimal concentration of the specific catalyst system employed will become apparent to the skilled artisan. Although the quality of the methyl acetate produced by this method is very good, higher purity methyl acetate is needed. When sulfuric acid is used as the catalyst, the flow rate found to be most beneficial in the process of the present invention is about one kg of sulfuric acid per 100 kg of acetic acid feed. The present invention provides a process for the production of high purity methyl acetate from methanol and glacial acetic acid wherein the acetic acid functions both as reactant and as extractive agent. The process of claim 15 which further comprises controlling the methanol feed rate so as to maintain at a preselected constant level the temperature of a point located in the column below the methanol feed and controlling the distillate flow rate so as to maintain at a preselected constant level the temperature of a point located in the middle to upper part of the reaction section of the column. These compounds exhibit boiling points which are considerably higher than the boiling point of methyl acetate. The vapor sidedraw stream and the corresponding return streams are indicated by numerals 11 and 13, 17, and 21, respectively. 22. No. The point should be located at a position where the reaction mixture composition, particularly the water concentration, changes sharply. What do you Need to Know About Ethyl Acetate? The amount of acetic anhydride in stream 100 can vary widely, but preferably the amount of acetic anhydride ranges from 1 to 10% by weight of the amount of acetic acid fed to the reactive distillation column. Membrane characterizing using FT-IR, SEM, XRD, TGA and DS (swelling degree). The hold tank product vapor is returned from hold tank 25 to reactor/column 1 through line 27. Investigation of the effects of different experimental variables revealed that acid conversion was increased and water permeance through the membranes was correspondingly enhanced with increasing silica content of the membranes. Steam is applied to the base of the column through line 9. The reaction conditions are moderate, however, as methyl acetate, methanol Heat and live steam are applied to the bottom of the column by means not shown. At preferred catalyst concentrations, the residence time in the column is at least about two hours. 19. methyl acetate carbonylation production reaction prijava Prior art date 2008-11-27 Application number RS20140273A Other languages English (en) Serbian (sr) Unknown language (xx) Inventor Nicholas John Hazel Lesley Ann Key Mark Stephen Roberts John Glenn Sunley Original Assignee Bp Chemicals Limited Priority date (The priority date is an assumption and is not a legal conclusion. required to produce high purity methyl acetate. The area labeled as 33 represents the approximate limits of the methanol/water stripping section of the column. The column provides intimate contact between the acetic acid and the methanol and between the acetic acid and the azeotropes (methyl acetate/water and methyl acetate/methanol) which are formed in the column. (b) countercurrently flowing approximately stoichiometric quantities of glacial acetic acid and methanol through said single reactive distillation column in the presence of sulfuric acid, which is fed to the column at a rate of about 1 kg of sulfuric acid per 100 kg of acetic acid, so as to provide intimate contact in said column between said acetic acid and methanol, between said acetic acid and methyl acetate/water azeotrope, and between said acetic acid and methyl acetate/methanol azeotrope, the residence time in said column being at least about 2.4 hours and the reflux ratio being about 1.5 to 1.7; (c) removing intermediate boiling compounds comprising methyl propionate, methyl butyrate, isopropyl acetate, and mixtures thereof from a vapor sidedraw stream which is continuously removed from and returned to the middle to upper part of the reaction section of said column; (d) controlling the methanol feed rate within about ±10% of the target flow rate so as to maintain at a preselected constant level the temperature of a point located in the column below the methanol feed and controlling the methyl acetate distillate flow rate within about ±5% of the target flow rate so as to maintain at a preselected constant level the temperature of a point located in the middle to upper part of the reaction section of said column; and.

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