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Production method and device of refined glycerin in non-distillation techniques

A production method and technology of glycerin, which is applied in the field of refined glycerin production and equipment of non-rectification technology, can solve the problems of unsuitability for small and medium-sized enterprises, high energy consumption, huge system, etc., and achieve low construction cost, simple equipment structure and reliable operation good sex effect

Inactive Publication Date: 2013-11-27
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings of the existing glycerin refining technology, such as high energy consumption, huge system, and unsuitability for small and medium-sized enterprises, the present invention provides a non-rectification technology refined glycerin production method and device, which have low energy consumption, simple device, and the obtained Glycerin with high purity

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  • Production method and device of refined glycerin in non-distillation techniques

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Embodiment 1

[0029] A non-distillation technology refined glycerin production method, using multi-stage flash dehydration, hydrocyclone separation to desalt, thin film evaporation refining, graded condensation methods to refine glycerin, specifically: crude glycerin is subjected to one-stage flash evaporation at ≤ 30kPa , the kettle liquid after the primary flash evaporation is partially heated and then continues to return to the primary flash tank for circulation, and the remaining part is subjected to secondary flash evaporation at ≤ 2kPa, and the kettle liquid after the secondary flash evaporation is partially heated and then re-enters the secondary The flash tank is circulated, and the remaining part enters the hydrocyclone for preliminary desalination, and then thin-film evaporation desalination refines the steam to obtain glycerol with a purity of ≥99.5%wt after multi-stage condensation. Combine below figure 1 Further explanation of the refining process:

[0030] 1) Primary flash ev...

Embodiment 2

[0037] A non-distillation technology refined glycerin production method, using multi-stage flash dehydration, hydrocyclone separation to desalt, thin film evaporation refining, graded condensation methods to refine glycerin, specifically: crude glycerin is subjected to one-stage flash evaporation at ≤ 30kPa , the kettle liquid after the primary flash evaporation is partially heated and then continues to return to the primary flash tank for circulation, and the remaining part is subjected to secondary flash evaporation at ≤ 2kPa, and the kettle liquid after the secondary flash evaporation is partially heated and then re-enters the secondary The flash tank is circulated, and the remaining part enters the hydrocyclone for preliminary desalination, and then thin-film evaporation desalination refines the steam to obtain glycerol with a purity of ≥99.5%wt after multi-stage condensation. The temperature during the primary flash evaporation is 140-150° C., and the water content in the ...

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Abstract

The invention discloses a production method and a device of refined glycerin in non-distillation techniques, characterized by using methods of dehydration with multistage flash-evaporation, removement of salts with liquid cyclone separation, refining with thin-film evaporation, and fractional condensation to refine glycerin. The method comprises the following steps: carrying out stage 1 flash-evaporation on crude glycerin with the pressure of no larger than 30 kPa, then heating the part of flash-evaporated residue and allowing the heated flash-evaporated residue to go back to a stage 1 flash drum for circulating, carrying out stage 2 flash-evaporation on the rest residue of the stage 1 flash-evaporation with the pressure of no larger than 2kPa, then heating the flash-evaporated residue and allowing the heated flash-evaporated residue to go back to a stage 2 flash drum for circulating, allowing the rest residue of the stage 2 flash-evaporation to go into a hydrocyclone and carrying out preliminary desalination, then carrying out refining with thin-film evaporation, carrying out multi-stage condensation on the desalinated and refined steam to obtain the glycerin with purity of no less than 99.5 %. The device comprises multi-stage flash drums, a hydrocyclone, a thin-film evaporator, and a multi-stage condensator in series. According to the invention, the production of refined glycerin can be carried out continuously, and the purity of the glycerin can reach more than 99.5%.

Description

Technical field: [0001] The invention relates to a production method of refined glycerin with multi-stage flash evaporation, graded condensation and multi-layer desalination, which is suitable for the purification and refinement of glycerin. Background technique: [0002] At present, domestic production of high-purity glycerin is generally obtained by rectifying crude glycerin with a content of more than 80%. Since glycerin has a boiling point of 290°C under normal pressure and begins to decompose and polymerize at 204°C, glycerol essence Distillation must be carried out under reduced pressure, and the main refining equipment is a rectification column. Although the operation flexibility of the rectification tower is large, the structure is complex, there are many auxiliary equipment, the operation system is huge, the operation cost is high, and the cost is expensive. In order to ensure the purity of glycerin and the temperature gradient between the trays in the column, a la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/22C07C29/76
Inventor 蒋剑春张天健陈水根聂小安许彬陈玉湘许玉戴伟娣高一苇
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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