Preparation method of acetic acid

A technology of acetic acid and acetaldehyde, which is applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of loss of activity and short service life, so as to improve the efficiency, prolong the service life and improve the catalytic effect. Effect

Inactive Publication Date: 2021-06-29
山东泓达生物科技有限公司
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  • Abstract
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Problems solved by technology

The existing catalyst manganese acetate has the problem that the service life is too short, and it will lose its activity after 30 days of use

Method used

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  • Preparation method of acetic acid

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preparation example Construction

[0024] The invention provides a kind of preparation method of acetic acid, comprises the following steps:

[0025] Manganese acetate is mixed with demineralized water to obtain manganese acetate solution;

[0026] Preheating acetic acid to obtain preheating acetic acid;

[0027] The preheated acetic acid and manganese acetate solution are mixed and then heated to obtain a manganese circulating fluid;

[0028] The manganese circulating fluid is mixed with acetaldehyde to carry out oxidation reaction to obtain acetic acid.

[0029] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in this field.

[0030] The invention mixes manganese acetate and demineralized water to obtain manganese acetate solution.

[0031] In the present invention, the pH value of the demineralized water is preferably >7, the total hardness is preferably ≤0.03, and the suspended matter is preferably ≤5mg / L.

[0032] In the present invent...

Embodiment 1

[0052] 1. Prepare the project

[0053] 1.1 Prepare 7 bags of manganese acetate (25kg / bag);

[0054] 1.2 50Kg demineralized water, demineralized water needs to be tested, standard: pH value > 7, total hardness ≤ 0.03, suspended solids ≤ 5mg / L;

[0055] 1.3 One electronic scale, two stainless steel barrels, two stirrers, thermometer (range ≥ 120 ℃), gloves and gas mask labor protection supplies.

[0056] 2. Preparation process

[0057]2.1 Check whether the pipes connected to the manganese preparation kettle are well connected and whether the valves are in normal condition.

[0058] 2.2 Add a small amount of finished acetic acid (50kg / time) to the manganese preparation kettle from the metering tank, and wash it twice until the blowdown liquid is clean, transparent and colorless.

[0059] 2.3 Add the finished acetic acid to the manganese preparation kettle until the liquid level reaches 90cm (corresponding to the liquid level of the finished product metering tank 15cm, 900kg of...

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Abstract

The invention provides a preparation method of acetic acid, and belongs to the technical field of catalysts. The preparation method of acetic acid comprises the following steps: mixing manganese acetate with softened water to obtain a manganese acetate solution; preheating acetic acid to obtain preheated acetic acid; mixing the preheated acetic acid and the manganese acetate solution, and then heating to obtain a manganese circulating liquid; and mixing the manganese circulating liquid with acetaldehyde, and carrying out oxidation reaction to obtain acetic acid. According to the invention, the catalytic effect of a catalyst is optimized and the reaction yield is improved by changing the preparation process and process conditions; in the prior art, the solubility of manganese acetate in acetic acid is reduced along with the increase of the concentration of acetic acid, and the concentration of the finished product acetic acid is high during preparation, so that the dissolution amount of manganese acetate during preparation is reduced; and softened water is used as a dissolving solution, so that the dissolving amount of vinegar manganese can be greatly increased, the catalytic effect of the catalyst is effectively improved, and the reaction yield is increased so as to prolong the service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing acetic acid. Background technique [0002] Acetic acid, also called acetic acid, glacial acetic acid, chemical formula CH 3 COOH, an organic monobasic acid, is the main component of vinegar. Pure anhydrous acetic acid is a colorless hygroscopic solid with a freezing point of 16.6°C (62°F). After solidification, it becomes a colorless crystal. Its aqueous solution is weakly acidic and highly corrosive. The steam is irritating to the eyes and nose. Acetic acid is used as an acidity regulator, acidulant, pickling agent, flavor enhancer, spice, etc. It is also a good antimicrobial agent, mainly due to its ability to lower the pH below that required for optimal growth of microorganisms . Acetic acid is the earliest and most used sour agent in my country. It is mainly used in compound seasoning, wax preparation, canned food, cheese, jelly, etc. When used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/235C07C53/08
CPCC07C51/235C07C53/08
Inventor 李培金耿春园李宝山曹永华
Owner 山东泓达生物科技有限公司
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