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 invention further comprises in preferred embodiments the use of a temperature control scheme whereby the overhead and the bottoms compositions are controlled by using two temperature control loops. The process of claim 1 wherein said acidic catalyst is selected from sulfuric acid, phosphoric acid, acidic cation exchange resin, and mixtures thereof. The vapor stream is passed through wire mesh separator 12, from which entrained sulfuric acid is returned to the column through line 13, and the remaining components of the vapor sidedraw stream are fed through line 14 to a first sidedraw distillation column 15. However, when a catalyst such as phosphoric acid is used, higher catalyst concentrations and/or larger reactor sizes are required, and when a cation exchange resin requiring packed sections is utilized, complex reactor designs are involved. A reflux stream is returned to the column through line 30, and a product stream is taken off through line 31. 5. The location of the catalyst feed appears to be one factor which affects the amount of water and/or methanol present in the product. The optimal concentration of the specific catalyst system employed will become apparent to the skilled artisan.
The highest corrosion rates are encountered in the lower half of the methanol stripping section and in the base heater.
4,435,595.
The process comprises the steps of (a) counter-currently flowing approximately stoichiometric quantities of acetic acid and methanol through a single reactive distillation column in the presence of a catalytic amount of an acidic catalyst so as to provide intimate contact in the column between the acetic acid and methanol, between the acetic acid and methyl acetate/water azeotrope, and between the acetic acid and methyl acetate/methanol azeotrope, the residence time in the column being sufficient to accomplish high reactant conversion and to obtain high purity methyl acetate, and (b) continuously removing high purity methyl acetate from the top of the single column and continuously removing water from the bottom of the column. The flow of liquid from the inlet sump is designated by arrows 49. The acetic acid descends through the column while the methyl acetate product is taken overhead through line 29. By-product water, sulfuric acid, and excess methanol, if any, are withdrawn from the base of the column through line 28. Process for the production of methyl acetate by esterifying methanol with acetic acid, 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Esters of carboxylic acids; Esters of carbonic or haloformic acids, Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen, Acetic acid esters of monohydroxylic compounds, Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds, Recovery of acetic acid from dilute aqueous streams formed during a carbonylation process, Acetic anhydride and acetate ester co-production, Method for preparing methyl acetate, and reaction rectification tower possessing spatial column plates of mass transfer, Process for the production of ethanol by hydrogenation of methyl acetate, Process for the production of high purity acetic acid, Process for the production of acetic acid, Process for the preparation of ethyl acetate, Process for the production of acetic anhydride and acetic acid, Process for the production of acetic acid by carbonylation, Process for preparing new phenoxyalkyl carboxylic acid derivatives, A process for the production of fatty acid methyl esters, Continuous process for the production of terephthalic acid, Method for the production of acetic acid and methanol by hydrolysis of methyl acetate by means of reactive distillation, Producing ethanol by continuous acid hydrolysis, Process for carbonylating alcohol to carboxylic acid,especially methanol to acetic acid, Process for preparing any alcoholic acid derivatives, Process for producing vinyl acetate, acetic acid and ethanol, Process for preparing acetic acid methyl acetate acetic anhydride/mixtures thereof, Production of acetic acid, propionic acid and their esters, Homologation process for the production of ethanol from methanol, Continuous manufacture of acetic acid ester, Process for the decomposition of (+)-i-(-)-6-methoxy-alpha-methyl-2-naphthalin acetic acid, (d1)-16-phenoxy-and 16-substituted phenoxy-9-keto prostatrienoic acid derivatives and processes for the production thereof, Method for the production of high purity terephthalic acid.
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