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Improvement to methods for continuous production of acetic acid and/or methyl acetate

A kind of technology of methyl acetate and acetic acid, applied in the improvement field of continuous production of acetic acid and/or methyl acetate, can solve problems such as no one has proposed

Inactive Publication Date: 2004-10-20
ACETEX CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] In any case, the problem of monitoring the acetic acid reactor and especially maintaining the water and methyl acetate concentrations is well defined, but no one has yet proposed a means of automatically accomplishing these objectives
[0036] Furthermore, there is currently no literature addressing the problems caused by large or small fluctuations in the CO stream entering the reactor, or seeking to overcome the resulting disadvantage in acetic acid production

Method used

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  • Improvement to methods for continuous production of acetic acid and/or methyl acetate
  • Improvement to methods for continuous production of acetic acid and/or methyl acetate
  • Improvement to methods for continuous production of acetic acid and/or methyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] Embodiment 1 (comparative example)

[0125] In this example, acetic acid is produced by the liquid phase carbonylation of methanol with carbon monoxide in the apparatus shown in Figure 1 in the presence of a homogeneous catalyst system.

[0126] The carbonylation reaction was carried out at a total pressure of 29 bar absolute and a temperature of 185°C.

[0127] The water concentration was kept at a value of 14% by weight of the reaction medium.

[0128] Concentrations expressed by weight of reaction medium are as follows:

[0129] ●Water: 14%

[0130] ●Iodomethane: 10%

[0131] ●Methyl acetate: 1.75%

[0132] ●Acetic acid and catalyst: up to 100%

[0133] The production rate of acetic acid is 54.1T / h.

[0134] In the case shown in the figure, the plant comprises: a reaction zone I consisting essentially of a reactor 1, a flash zone II comprising essentially a flash evaporator 2, and a zone comprising three distillation columns 3, Purification zon...

Embodiment 2

[0171] This embodiment illustrates how to implement the method of the present invention, in order to figure 2 Acetic acid is produced in the apparatus shown and under the operating conditions of Example 1.

[0172] figure 2 The arrangement shown in represents a modification of the arrangement shown in FIG. 1 and includes a multivariable predictive controller 40.

[0173] The controller 40 is programmed to adjust the target variable around the setpoint by acting on the action variable.

[0174] In this Example 2, the target variables to be adjusted were the carbon monoxide feed rate and the CO 2 selective. The action variables are the temperature in Reactor 1 and the feed rate of methanol to this reactor.

[0175] More specifically, controller 40 receives:

[0176] - the feed rate of carbon monoxide in the reactor 1 measured by the flow meter 9 at the first input E1;

[0177] - At the second input end E2, the CO of the reaction is calculated by the calculation module 21' ...

Embodiment 3

[0206] This example also refers to the industrial plant and equipment used in Example 2.

[0207] However, the controller 40 is also used in this example to control the flow of circulating liquid into the reactor 1 to the level of liquid in the reactor.

[0208] The main liquid stream entering Reactor 1 is:

[0209] ● Methanol feed rate - F1

[0210] - Recycle streams entering the reactor from Zones II and III, namely:

[0211] - circulating liquid components from the flash zone and circulating liquid from the bottom of the first distillation column - F2

[0212] - Recycle part of the aqueous liquid phase from the top of the first distillation column - F3

[0213] - Recycle organic liquid phase from the top of the first distillation column - F4

[0214] - Recycle partially condensed liquid from the top of the second distillation column - F5

[0215] The main liquid stream leaving the reactor consists of stream-F6 which enters the flash zone from the reactor.

[0216] In ...

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Abstract

The invention relates to a method for the continuous preparation of acetic acid and / or methyl acetate by carbonylation using carbon monoxide, methanol or a methanol derivative that can be carbonylated, in liquid phase, in the presence of water and a catalytic system. According to the invention, in order to improve the production of acetic acid and / or methyl acetate, the temperature of the reactor and the inlet flow of methanol, or the methanol derivative that can be carbonylated, into said reactor are controlled by the inlet flow of carbon monoxide and by at least one of the parameters that define the composition of the reaction medium and / or events, said automatic control being performed preferably by means of a predictive multi-variable regulator. The inventive method is suitable for use in Monsanto-type preparation methods and low water content methods.

Description

technical field [0001] The present invention relates to a kind of improvement to the continuous preparation method of acetic acid and / or methyl acetate. [0002] More specifically, the improvement aims at improving the monitoring and control of the acetic acid and / or methyl acetate production process in order to improve the production of acetic acid and / or methyl acetate. Background technique [0003] Among the common acetic acid production methods, the one most widely used in industry is the carbonylation reaction of methanol or, more generally, a carbonylatable derivative of methanol with carbon monoxide. The reaction is carried out in the liquid phase under the pressure of carbon monoxide in the presence of a homogeneous catalyst system in which carbon monoxide is one of the reactants. [0004] The rhodium-based carbonylation process is a well known process employed in industry and has been the subject of numerous articles and patents (eg US Patent Nos. US 3,769,329 and ...

Claims

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Application Information

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IPC IPC(8): C07B61/00C07C51/12C07C53/08C07C67/08C07C67/36C07C67/37C07C69/14
CPCC07C51/12C07C67/36C07C67/37C07C53/08C07C69/14
Inventor D·蒂埃博
Owner ACETEX CHEM
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