Device for continuously converting glycerine into lactic acid by using hydrothermal reaction

Abstract

The invention relates to a device for continuously converting glycerine into lactic acid by using hydrothermal reaction under alkaline condition, being composed of a high pressure metering pump (2), a pressure stabilizing system, a hydrothermal reaction system, a cooler (14), a tube type filter (18), and a back pressure valve (19). The mixed liquid of 0.33mol / L of glycerine and 1.25mol / L of alkaline are fed into the hydrothermal reaction system by the high pressure metering pump (2), the hydrothermal condition of 300 DEG C and 10MPa is maintained under the co-action of hydrothermal reaction system, pressure stabilizing system and back pressure valve, and 83% glycerine continuous conversion rate and more than 60% lactic acid continuous generation rate can be stably obtained in 60min. Compared with using a reaction kettle, the invention realizes continuous conversion reaction from glycerine into lactic acid with reasonable design and simple operation, and can realize recycle of lactic acid in match with acid neutralization and separation treatment. The invention can be widely used for producing glycerine, the cheap side product of bio-diesel industry into lactic acid with higher industrial value, thus realizing utilization of waste and expansion of bio-diesel industry chain.

Description

technical field

[0001] The invention relates to a device for continuously converting glycerin into lactic acid by using hydrothermal reaction, specifically a continuous device for hydrothermally converting crude glycerol, a by-product of biodiesel, into lactic acid by using hydrothermal reaction, which belongs to chemical equipment and waste recycling technology field. Background technique

[0002] At present, under the circumstances that fossil energy is becoming exhausted and environmental pollution is becoming more and more serious, biodiesel, as a sustainable and carbon-neutral new energy source, has attracted more and more attention from all countries in the world. A plan to increase the proportion of biodiesel used. With the large-scale production of biodiesel, the main by-product glycerol also accumulates in large quantities. The value of crude glycerin is not high. The traditional utilization plan is to produce nitroglycerin and soap, but it can no longer solve the...

Examples

Embodiment Construction

[0023] see Figure 1-4 .

[0024] The invention is a continuous hydrothermal conversion device for converting crude glycerin, a by-product of biodiesel, into lactic acid, and its purpose is to realize the conversion and utilization of crude glycerin, the main by-product of biodiesel. Glycerin comes from a biodiesel company in Shanghai. Biodiesel is produced by microbial fermentation, and glycerol is the main by-product. After the crude glycerol is skimmed off scum and impurities, it is neutralized by acid and alkali to adjust to a glycerol solution with a glycerin content of about 10 mg / L, and then NaOH solid is added to a concentration of 16.47 mg / L to prepare a mixed solution and put it into the present invention. In the sampling container 1 of the continuous hydrothermal reaction device, the sampling container 1 is connected to the inlet of the high-pressure metering pump 2 through a polytetrafluoroethylene pipe, and the high-pressure metering pump 2 is fixedly installed o...

technical field

[0001] The invention relates to a device for continuously converting glycerin into lactic acid by using hydrothermal reaction, specifically a continuous device for hydrothermally converting crude glycerol, a by-product of biodiesel, into lactic acid by using hydrothermal reaction, which belongs to chemical equipment and waste recycling technology field. Background technique

[0002] At present, under the circumstances that fossil energy is becoming exhausted and environmental pollution is becoming more and more serious, biodiesel, as a sustainable and carbon-neutral new energy source, has attracted more and more attention from all countries in the world. A plan to increase the proportion of biodiesel used. With the large-scale production of biodiesel, the main by-product glycerol also accumulates in large quantities. The value of crude glycerin is not high. The traditional utilization plan is to produce nitroglycerin and soap, but it can no longer solve the...

Examples

Embodiment Construction

[0023] see Figure 1-4 .

[0024] The invention is a continuous hydrothermal conversion device for converting crude glycerin, a by-product of biodiesel, into lactic acid, and its purpose is to realize the conversion and utilization of crude glycerin, the main by-product of biodiesel. Glycerin comes from a biodiesel company in Shanghai. Biodiesel is produced by microbial fermentation, and glycerol is the main by-product. After the crude glycerol is skimmed off scum and impurities, it is neutralized by acid and alkali to adjust to a glycerol solution with a glycerin content of about 10 mg / L, and then NaOH solid is added to a concentration of 16.47 mg / L to prepare a mixed solution and put it into the present invention. In the sampling container 1 of the continuous hydrothermal reaction device, the sampling container 1 is connected to the inlet of the high-pressure metering pump 2 through a polytetrafluoroethylene pipe, and the high-pressure metering pump 2 is fixedly installed o...

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