Process for continuously producing isobutyric acid

A technology of isobutyric acid, continuous method, applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate, chemical instruments and methods, etc., can solve problems such as difficulty in realizing continuous production

Active Publication Date: 2011-04-13
YIXING HENGXING FINE CHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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But this method is suitable for batch operati...

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  • Process for continuously producing isobutyric acid
  • Process for continuously producing isobutyric acid
  • Process for continuously producing isobutyric acid

Examples

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Embodiment 1

[0013] Embodiment 1, the reactive distillation device is made of reaction kettle, rectification tower body and the condenser and gas-liquid separator at the atmospheric pressure outlet of tower top, reaction kettle 2L, rectification tower internal diameter 8cm, height 2m, in the middle of tower body It is equipped with a packing with a height of 1.8m (the packing can be porcelain ring or stainless steel packing). The reaction material is isobutyraldehyde, the reaction section of the rectification tower is equipped with a jacketed water cooling device, and the catalyst is an isobutyric acid solution with a weight content of 10% manganese acetate. The isobutyraldehyde feed rate is 40g / h, the configured catalyst feed rate is 8g / h, the air flow rate is 50L / h, and the reaction product is continuously discharged to keep the liquid level in the reactor at the bottom of the tower constant (the same below). Its discharge rate is 50.5g / h, and the gas flowing out from the top of the towe...

Embodiment 2

[0014] Embodiment 2, reaction unit, feeding and discharging mode and product analysis method are with embodiment 1, and catalyzer is the manganese acetate isobutyric acid solution that weight content is 15%, and isobutyraldehyde feed rate is 40g / h, and catalyzer feed rate is 4g / h, the discharge rate of the reaction product is 50g / h, the air flow rate is 50L / h, the kettle temperature is 70°C, and the reaction zone temperature is 45°C. The reaction results are shown in Table 1.

Embodiment 3

[0015] Embodiment 3, reaction unit, feeding and discharging mode and product analysis method are with embodiment 1, and catalyzer is the manganese acetate isobutyric acid solution that weight content is 20%, and isobutyraldehyde feed rate is 40g / h, and catalyzer feed rate is 2g / h, the discharge rate of the reaction product was 50.4g / h, the air flow rate was 50L / h, the kettle temperature was 80°C, and the reaction zone temperature was 50°C. The reaction results are shown in Table 1.

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Abstract

The invention discloses a process for continuously producing isobutyric acid, and belongs to the field of production of fine chemicals. In the process, a rectification mode is adopted for reaction; isobutylaldehyde and prepared catalyst solution serving as reaction raw materials are pumped from the upper part of a rectifying tower to flow from top to bottom; oxygen-containing gas is pumped from areaction kettle at the bottom of the tower; after the gas passes through a gas distributor, fine gas bubbles flow upwards in a backflow way; the middle part of the rectifying tower is a reaction section which accommodates a porcelain ring or a stainless steel filler; the isobutylaldehyde and the oxygen-containing gas are converged on a filler layer of the rectifying tower to react under the action of a catalyst; generated isobutyric acid which is enriched on a tower kettle is continuously discharged from the tower kettle; and the heat discharged by the reaction is removed by cooling water of a jacket. The continuous process is more environmental-friendly, saves energy and has high efficiency, isobutylaldehyde conversion rate of more than 90 percent and isobutyric acid selectivity of more than 95 percent.

Description

technical field [0001] The invention relates to a continuous production process of isobutyric acid, which belongs to the field of fine chemical production. Background technique [0002] The production of isobutyric acid can usually be obtained by oxidation of isobutyraldehyde or isobutanol as raw materials. The production of isobutyric acid by isobutanol oxidation method has high cost, low yield and many wastes. The production of isobutyric acid by oxidation of isobutyraldehyde has the advantages of low cost, high product selectivity and simple process. At present, the industrial production of isobutyric acid generally adopts the liquid-phase oxidation method of isobutyraldehyde as raw material, and uses carboxylates such as Mn, Cu, Co, and Fe as catalysts. [0003] U.S. Patent No. 5,068,366 discloses a method for co-producing isobutyric acid. Carboxylates such as Mn, Cu, and Co are used as catalysts to oxidize isobutene and isobutyraldehyde. Isobutyric acid is used as a c...

Claims

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Application Information

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IPC IPC(8): C07C53/124C07C51/235C07C51/44
Inventor 张千崇明本费建强何珍娟王恒秀陈维斌
Owner YIXING HENGXING FINE CHEM
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