A kind of method utilizing synthetic triacetone amine process by-product to prepare acetone

A technology of triacetoneamine and by-products, applied in the field of preparation of acetone, can solve problems such as yield affecting reaction conversion, environmental pollution, and synthesis process conditions cannot be satisfied at the same time, and achieve the effects of improving yield and reducing comprehensive production costs

Active Publication Date: 2021-03-23
HENGSHUI KAIYA CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These by-products will be separated in the crude triacetone amine refining process, and recycled to the next batch to be mixed with acetone and used as raw materials for the production of triacetone amine; The optimization conditions are different, especially there is a big difference between acetone and acetone dimer, and between acetone and acetone trimer, so that the synthesis process conditions cannot meet the conditions of acetone to triacetone amine, dimer to triacetone amine and trimer to the optimal process condition of triacetone amine, and under the maximum yield technology that satisfies the acetone to triacetone amine operational route, can directly affect dimer and trimer to the reaction conversion of triacetone amine Yield, resulting in reduced utilization of dimer and trimer components in the mixed feedstock (series of by-products)
[0004] In addition, because the process cannot match the optimal yield conditions of different reaction starting materials at the same time, the above-mentioned by-products will often be used as fuel oil, directly causing environmental pollution and other social problems

Method used

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  • A kind of method utilizing synthetic triacetone amine process by-product to prepare acetone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the first step, 3000kg of by-products are poured into the high-temperature tank, and the by-products are analyzed by gas chromatography and composed of: 3.57% acetone, 42.03% mesityl oxide, 1.68% diacetone alcohol, 0.19% diacetone amine, DHP (2, 2,4,6-tetramethyl-2,3-dihydropyridine) 17.6%, acetonin 31.4%, phorone 0.17%, triacetonamine 1.24%, other components 2.12%;

[0027] Second step, add decyl diamine 300kg, water 3000kg in reactor;

[0028] The third step is to start stirring and heat the kettle to 85°C;

[0029] The fourth step is to drop by-products into the kettle and keep the temperature of the kettle at 85°C;

[0030] The 5th step, after by-product dropwise addition, obtain regenerated acetone 2196kg, analyze acetone 97.30% through gas chromatography, analyze water content 1.84% through Karl Fischer method, still liquid is formed through gas chromatography analysis: acetone 5.71%, isopropyl 0.34% diacetone, 85.26% DHP, 1.06% acetonin, 1.69% triacetonamine...

Embodiment 2

[0032] In the first step, 3000kg of by-products are poured into the high-temperature tank, and the by-products are analyzed by gas chromatography and composed of: 3.57% acetone, 42.03% mesityl oxide, 1.68% diacetone alcohol, 0.19% diacetone amine, DHP (2, 2,4,6-tetramethyl-2,3-dihydropyridine) 17.6%, acetonin 31.4%, phorone 0.17%, triacetonamine 1.24%, other components 2.12%;

[0033] In the second step, add 600kg of secondary amino-based cation exchange resins, 3000kg of water in the reactor;

[0034] The third step is to start stirring and heat the kettle to 90°C;

[0035] The fourth step is to drop by-products into the kettle and keep the temperature of the kettle at 90°C;

[0036] The 5th step, after by-product dropwise addition, obtain regenerated acetone 2015kg, analyze acetone 97.13% through gas chromatography, analyze water content 1.79% through Karl Fischer method, still liquid is formed through gas chromatography analysis: acetone 4.27%, isopropyl 7.14% triacetone,...

Embodiment 3

[0038] In the first step, 3000kg of by-products are poured into the high-temperature tank, and the by-products are analyzed by gas chromatography and composed of: 3.57% acetone, 42.03% mesityl oxide, 1.68% diacetone alcohol, 0.19% diacetone amine, DHP (2, 2,4,6-tetramethyl-2,3-dihydropyridine) 17.6%, acetonin 31.4%, phorone 0.17%, triacetonamine 1.24%, other components 2.12%;

[0039] In the second step, add 900kg of porous alumina loaded with potassium carbonate in the reactor, and 3000kg of water;

[0040] The third step is to start stirring and heat the kettle to 95°C;

[0041] The fourth step is to drop by-products into the kettle and keep the temperature of the kettle at 95°C;

[0042] The 5th step, after by-product dropwise addition, obtain regenerated acetone 1857kg, analyze acetone 97.13% through gas chromatography, analyze water content 2.03% through Karl Fischer method, still liquid is formed through gas chromatography analysis: acetone 5.34%, isopropyl 8.59% triac...

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Abstract

The invention belongs to the technical field of preparation of acetone and particularly discloses a method of preparing acetone from byproducts of a triacetonamine synthetic process. According to themain technical scheme, the byproducts of the triacetonamine synthetic process are introduced into a high tank; a catalyst and water are added into a reactor; the reactor is started to allow stirring,and the reactor is heated to 60-100 DEG C; the high tank dropwise adds the products into the reactor; a condenser is started to provide cooling water, and regenerated acetone is collected from a storage tank; after the reaction ends, the regenerated acetone is directly added into a main triacetonamine production line as a synthetic material; after water is supplemented to the reactor, next acetoneregeneration is entered. The method of preparing acetone from byproducts of the triacetonamine synthetic process has the advantages that byproduct utilization value is improved and by the full process, triacetonamine can be synthesized from acetone under higher yield.

Description

technical field [0001] The invention belongs to the technical field of preparation of acetone, and in particular relates to a method for preparing acetone by using a by-product in the process of synthesizing triacetone amine. Background technique [0002] The chemical name of triacetonamine is 2,2,6,6-tetramethylpiperidone, which is an important hindered amine light stabilizer intermediate and pharmaceutical intermediate, especially in the field of hindered amine light stabilizer, triacetonamine It is the only parent nucleus of the hindered amine light stabilizer piperidine derivatives, and is an important raw material for the synthesis of tetramethylpiperidinol, tetramethylpiperidinamine and polymerization inhibitor 702. [0003] The industrialized production of triacetone amine uses acetone and ammonia as raw materials and is synthesized under the action of an acidic catalyst. The synthesis of triacetone amine produces compounds including mesityl oxide, diacetone alcohol,...

Claims

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Application Information

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IPC IPC(8): C07C49/08C07C45/85
CPCC07C45/85C07C49/08
Inventor 赵晓锋刘俊华王慧君曹乐乐张文静
Owner HENGSHUI KAIYA CHEM
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