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Process for preparing sodium dehydroacetate

A technology of sodium dehydroacetate and preparation process, applied in the directions of organic compound/hydride/coordination complex catalyst, organic chemistry, physical/chemical process catalyst, etc., can solve the problem of high production cost, complicated production steps and product yield Low problems, to achieve the effect of saving energy and material consumption, inhibiting the formation of polymers, and shortening the process

Active Publication Date: 2010-11-17
NINGBO WANGLONG TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, the dehydroacetic acid polymerization process technology is based on the mature process of acetic acid cracking to generate ketene, combined with the production of diketene products, a new set of low-consumption and high-yield new process routes has been developed by itself, so as to solve the problem of product yield in the existing process. low production rate, complex production steps and high production costs to meet the growing domestic demand for this important organic intermediate

Method used

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  • Process for preparing sodium dehydroacetate
  • Process for preparing sodium dehydroacetate
  • Process for preparing sodium dehydroacetate

Examples

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Embodiment 1

[0026] like figure 1 , figure 2 Shown, the preparation process of sodium dehydroacetate is characterized in that: comprise the preparation process of diketene; The polymerization process of dehydroacetic acid; The separation process of dehydroacetic acid; The preparation process of sodium dehydroacetate.

[0027] The preparation process of diketene includes:

[0028] Pure ketene gas from the acetic acid cracking section enters The crude diketene liquid introduced from the bottom of the corrugated full-plate packing absorption tower and the top of the tower is sprayed down and subjected to countercurrent contact at 8°C to be absorbed; the absorption liquid flows into 5m 3 Polymerization kettle, polymerized at 20°C to generate crude diketene, the crude diketene solution after polymerization is returned to the absorption tower, and the process of absorption and polymerization is carried out cyclically; the reaction tail gas escaping from the top of the tower is discharged int...

Embodiment 2

[0036] The preparation process of the diketene is to introduce the ketene gas into the bottom of the corrugated full-plate packed absorption tower, and spray and absorb the crude diketene entering from the top under the condition of 5° C. to form an absorption liquid, which enters the polymerization tank; Polymerize at ℃ to generate crude diketene, which is then pumped into the absorption tower for circular spraying; when the content of diketene in the polymerization kettle reaches 80%, it will be diverted into the crude diketene metering tank. All the other are with embodiment 1.

Embodiment 3

[0038] The preparation process of said diketene is to introduce ketene gas into the bottom of the corrugated full-plate packed absorption tower, and to spray and absorb the crude diketene entering from the top at 10°C to form an absorption liquid, which enters the polymerization tank; Polymerize at ℃ to generate crude diketene, which is then pumped into the absorption tower for circular spraying; when the content of diketene in the polymerization kettle reaches 90%, it will be split into the crude diketene metering tank; the rest is the same as in Example 1.

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Abstract

The invention relates to a process for preparing sodium dehydroacetate. The process comprises preparation of diketene, polymerization of dehydroacetic acid, separation of the dehydroacetic acid, preparation of the sodium dehydroacetate and the like. The dehydroacetic acid is polymerized by adopting crude diketene finished product of the diketene as a raw material; the adopted screened good composite catalyst is mixed solution of triethylamine and ethylene glycol, so good catalytic polymerization effect can be achieved, and the formation of high polymer can be inhibited; and the pure sodium dehydroacetate is synthesized by adopting an initial dehydroacetic acid product which is not decolorized or refined as a raw material. Therefore, the preparation process simplifies the production process, shortens the flow, and reduces energy consumption and material consumption required in the traditional process at the same time.

Description

technical field [0001] The invention relates to a preparation process of dehydroacetic acid, in particular to a preparation process of sodium dehydroacetate. Background technique [0002] Dehydroacetic acid is a dimer of diketene, and it is also an important chemical raw material, intermediate, toughening agent, and broad-spectrum food preservative. Since its antibacterial properties were discovered in the 1940s, due to its strong antibacterial ability, it has a certain inhibitory effect on spoilage bacteria, molds, and yeasts. Strong acidity has a good antibacterial effect, and it is still effective even at high pH values. Therefore, it has been valued by many countries, and it has been widely used in food, leather and drug preservation abroad. It was used as a food additive in China in the 1980s. It was used in dry butter, fermented soybean products, salted or pickled vegetables, bread, cakes, fillings, compound seasonings, etc.; it was also used in daily cosmetics, fiber...

Claims

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Application Information

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IPC IPC(8): C07D309/38B01J31/02B01J31/04
Inventor 王国军
Owner NINGBO WANGLONG TECH
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