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Esterification technique of butyl lactate

A butyl lactate ester and process technology, applied in the chemical industry, can solve problems such as polluting the environment, corroding equipment, and carbonizing lactic acid

Inactive Publication Date: 2016-12-07
盐城华德(郸城)生物工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Butyl lactate is a colorless, transparent, stable, flammable liquid, slightly soluble in water, miscible with various paint solvents, thinners and oils, used in natural resins, synthetic resins, spices, paints, coatings, adhesives Among the adhesive nitrocellulose and ethyl cellulose, industrial production of butyl lactate uses sulfuric acid as a catalyst. Although sulfuric acid is cheap and easy to obtain and has high catalytic activity, there are many disadvantages. The main problem is that it is easy to carbonize lactic acid , oxidative decomposition, affecting product refinement and raw material recovery; severe corrosion of equipment, increasing fixed investment and production costs; "three wastes" treatment process is complicated, pollutes the environment, and causes great harm to the environment and human beings. With the continuous improvement of people's living standards Improvement, the requirements for the environment are getting higher and higher

Method used

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Experimental program
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Effect test

Embodiment 1

[0019] A kind of butyl lactate esterification process, described esterification process is as follows:

[0020] Step 1: batching, batching according to the specified ratio, using lactic acid and butanol as raw materials, the mass ratio of lactic acid and butanol is 1:1;

[0021] Step 2: Adding a novel catalyst, using dichromic acid as the catalyst, the mass ratio of the catalyst to lactic acid is 1:200;

[0022] Step 3: Control the esterification temperature. In the glass-lined reactor, add lactic acid and butanol according to the ratio in step 1, and carry out esterification under the condition of adding a catalyst. The esterification reaction temperature is controlled at 105-110°C ;

[0023] Step 4: stirring, stirring while esterifying, using a paddle stirrer to stir, so that the esterification reaction is fast and uniform;

[0024] Step 5: divide water, remove the moisture produced in the esterification process;

[0025] Step 6: Control the esterification time, and contr...

Embodiment 2

[0029] A kind of butyl lactate esterification process, described esterification process is as follows:

[0030] Step 1: batching, batching according to the specified ratio, using lactic acid and butanol as raw materials, the quality of lactic acid is 2000kg, and the quality of butanol is 2000kg;

[0031] Step 2: mix in novel catalyst, take dichromic acid as catalyst, and the quality of catalyst is 10kg;

[0032] Step 3: Control the esterification temperature. In the glass-lined reactor, add lactic acid and butanol according to the ratio in step 1, and carry out esterification under the condition of adding a catalyst. The esterification reaction temperature is controlled at 105-110°C ;

[0033] Step 4: stirring, stirring while esterifying, using a paddle stirrer to stir, so that the esterification reaction is fast and uniform;

[0034] Step 5: Water separation, during the esterification reaction, use a glass water separator to remove the generated water;

[0035] Step 6: Con...

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PUM

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Abstract

The invention relates to an esterification technique of butyl lactate. The technique comprises the following steps: by using lactic acid and butanol in a mass ratio of 1:1 as raw materials and dichromic acid as a catalyst (the mass ratio of the catalyst to the lactic acid is 1:200), proportioning, adding a novel catalyst, and carrying out esterification with stirring and water diversion while strictly controlling the esterification reaction temperature and esterification reaction time, thereby obtaining butyl lactate; and carrying out distillation and refinement. The technique has the characteristics of lower requirements for facility tool sets, simple preparation method, flexible reaction time and high product yield, does not need to add alkalis for neutralization since the catalyst has weak acidity, solves the problem of facility corrosion, and is safe and environment-friendly. The technique has the advantages of environment friendliness, high economy and high efficiency.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an esterification process, in particular to a butyl lactate esterification process. Background technique [0002] Butyl lactate is a colorless, transparent, stable, flammable liquid, slightly soluble in water, miscible with various paint solvents, thinners and oils, used in natural resins, synthetic resins, spices, paints, coatings, adhesives Among the adhesive nitrocellulose and ethyl cellulose, industrial production of butyl lactate uses sulfuric acid as a catalyst. Although sulfuric acid is cheap and easy to obtain and has high catalytic activity, there are many disadvantages. The main problem is that it is easy to carbonize lactic acid , oxidative decomposition, affecting product refinement and raw material recovery; severe corrosion of equipment, increasing fixed investment and production costs; "three wastes" treatment process is complicated, pollutes the environm...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/68
CPCC07C67/08C07C69/68
Inventor 严夕中夏继海王家宽薛宝国倪锡浪
Owner 盐城华德(郸城)生物工程有限公司
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