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Energy-saving and environment-friendly production process of isobutyl lactate

An energy-saving and environmentally-friendly technology of isooctyl lactate, which is applied in the preparation of ester groups and hydroxyl groups, organic chemistry, etc., can solve the problems of high corrosion of equipment, environmental pollution of waste water, and influence on the yield of finished products

Active Publication Date: 2016-03-09
谦信化工集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] In the traditional isooctyl lactate production process, sulfuric acid is often used as a catalyst for the esterification reaction, which is relatively corrosive to equipment and has many by-products
Secondly, the mixed solution after the esterification reaction is often neutralized with liquid caustic soda to neutralize the remaining lactic acid in the mixed solution, which wastes more lactic acid, and the use of liquid caustic soda is relatively large, and at the same time, a large amount of waste water will be generated to pollute the environment
Finally, when using liquid caustic soda to neutralize lactic acid, due to excessive alkali, turbid liquid will be generated during the neutralization process, which makes it difficult to separate the oil phase from the water phase and affects the yield of the finished product

Method used

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  • Energy-saving and environment-friendly production process of isobutyl lactate

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Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the device of the production process of isooctyl lactate of the present invention adopts continuous feeding, isooctanol and lactic acid are mixed according to the alkyd molar ratio of 1.8:1 and then thrown into the heater 3, and flow to the first reaction kettle after heating 1, the total flow rate is 1000L / h, when the conversion rate of lactic acid in the first reactor 1 reaches about 60%, it can be discharged into the second reactor 2, when the conversion rate of lactic acid in the second reactor 2 reaches about 85% % can be discharged into the water washing mixer 7 to fully mix with water, then flow into the water washing tower 8 and carry out standing stratification, the top oil phase of the water washing tower 8 is mixed with the liquid caustic soda through the alkali washing mixer 9, and then Go into the alkali washing tower 10 and stratify. The water phase at the bottom of the water washing tower 8 enters the middle part of the dehydra...

Embodiment 2

[0023] Such as figure 1 As shown, the device of the production process of isooctyl lactate of the present invention adopts continuous feeding, isooctanol and lactic acid are mixed according to the alkyd molar ratio of 1.8:1 and then thrown into the heater 3, and flow to the first reaction kettle after heating 1, the total flow rate is 1500L / h, when the conversion rate of lactic acid in the first reactor 1 reaches about 60%, it can be discharged into the second reactor 2, when the conversion rate of lactic acid in the second reactor 2 reaches about 85% % can be discharged into the water washing mixer 7 to fully mix with water, then flow into the water washing tower 8 and carry out standing stratification, the top oil phase of the water washing tower 8 is mixed with the liquid caustic soda through the alkali washing mixer 9, and then Go into the alkali washing tower 10 and stratify. The water phase at the bottom of the water washing tower 8 enters the middle part of the dehydra...

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Abstract

The invention discloses an energy-saving and environment-friendly production process of isobutyl lactate. A reaction of lactic acid and isooctanol adopts graded synthesis; the synthesis is carried out in two steps according to different conversion degrees of the lactic acid; a mixed solution obtained by the reaction is layered through water washing and then is layered through alkali washing; a coarse ester obtained by the alkali washing enters a light fraction removing tower to be subjected to light fraction removal and then enters a heavy fraction removing tower to be subjected to heavy fraction removal; the high-purity isobutyl lactate is discharged from the top of the heavy fraction removing tower. Water, which contains the lactic acid and is obtained by the water washing, passes through a dehydrating tower to be almost removed, and then the lactic acid returns back to a first reaction kettle to continually react. With the adoption of the process, 85 percent to 95 percent of the lactic acid in the reacted mixed solution can be recycled, the use amount of the liquid alkali in the alkali washing process is saved by 70 percent to 75 percent and the discharging amount of wastewater is reduced by 65 percent to 70 percent, so that the sufficient utilization of resources and reduction of wastewater discharge are realized and the energy-saving and environment-friendly aims are achieved.

Description

technical field [0001] The invention relates to an energy-saving and environment-friendly production process of isooctyl lactate. Background technique [0002] Lactate is an important synthetic raw material and industrial solvent, and has a wide range of applications in medicine, food, coatings and other fields. Isooctyl Lactate is a colorless, transparent liquid with a spicy aroma, suitable for use as a high-boiling solvent for paints and lubricating oils. One of the raw materials for the synthesis of isooctyl lactate by direct esterification is lactic acid, also known as 2-hydroxypropionic acid, which can be fermented from corn and other crops. It is a renewable raw material, so isooctyl lactate is also A kind of green environmental protection solvent. [0003] In the traditional isooctyl lactate production process, sulfuric acid is often used as a catalyst in the esterification reaction, which is relatively corrosive to equipment and has many by-products. Secondly, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C07C69/68
CPCC07C67/03C07C69/68
Inventor 赵楚榜于冬娥翁杏瑶
Owner 谦信化工集团有限公司
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