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Atmospheric pressure low temperature distillation and rectification process

A low-temperature distillation and rectification technology, applied in the field of separation technology, can solve the problems of high production cost, material decomposition, complicated equipment, etc., and achieve the effects of low production cost, accelerated volatilization speed, and wide application fields.

Inactive Publication Date: 2010-01-20
伍运洪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some heat-sensitive substances with high boiling point, high temperature will lead to the decomposition of the material, and the decompression capacity of the decompression equipment also has a certain limit
The molecular distillation technology uses the shortest distance between the evaporating surface and the condensing surface of the liquid material under high vacuum conditions to increase the pressure difference between the evaporating surface and the condensing surface, thereby realizing the distillation process. The principle is the same as that of ordinary distillation. The technology requires extremely high vacuum, complex equipment, and small processing capacity, so the production cost is high and the rectification process cannot be realized
Therefore, the general distillation process commonly used at this stage is difficult to separate such materials or the production cost is very high

Method used

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Examples

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Embodiment 1

[0011] Embodiment 1: Utilize the present invention to carry out distillation process to lactic acid.

[0012] Lactic acid is a typical non-volatile heat-sensitive substance with low saturated vapor pressure, boiling point 122°C (1.8 kPa, 14 mmHg), 82-85°C (66.6-133 Pa, 0.5-1 mmHg), but the distillation temperature Significant decomposition will occur above 130°C. At present, the commonly used extraction and purification processes for the production of lactic acid by fermentation include: calcium salt, zinc salt crystallization, ion exchange, electrodialysis, solvent extraction, etc., but these extraction processes are labor-intensive, equipment investment is high, and extraction loss is large , Low quality finished products and other shortcomings. The product quality can be greatly improved through the distillation process, but because the saturated vapor pressure of lactic acid is very low, and it is easy to decompose at high temperature, the distillation of lactic acid cann...

Embodiment 2

[0015] Example 2: Still taking lactic acid as an example, air is used as the carrier gas to distill lactic acid in a manner similar to spray drying.

[0016] as attached image 3 As shown, the lactic acid fermentation liquid 5 after acid hydrolysis is concentrated to 20-80%, heated to a temperature of 50°C-100°C, and then powered by a pump, the lactic acid solution 5 is sprayed into a mist through the nozzle and added to the gas-liquid mixing device 7 Here, because the sprayed lactic acid solution 5 liquid particles are very small, the liquid lactic acid solution 5 quickly volatilizes into the gas carrier 6 at 50°C-100°C, and the inorganic salts and non-volatile organic compounds (such as caramel) contained in the raw materials Pigment, protein, etc.) are dried into solids, separated from the gas carrier 6 by a solid-gas separation device 15, and the gas carrier 10 with lactic acid vapor is condensed to separate a lactic acid solution with a concentration of about 20-80%, and ...

Embodiment 3

[0018] Embodiment 3: Taking the production of natural vitamin E as an example, the rectification operation process is realized by adopting the present invention.

[0019] Natural VE is generally made of vegetable oil rich in VE or the deodorized fraction (and oil residue) of its refined by-products, which can be obtained through extraction and distillation. At present, there are mainly extraction methods (including the latest supercritical CO 2 Extraction), esterification, saponification, esterification-silicon chamber adsorption, enzymatic and gel filtration and other preparation methods.

[0020] Molecular distillation technology conducts molecular distillation under high vacuum conditions with a temperature of 220-240°C and a pressure of 103-105mmHg to separate components with boiling points close to those of vitamin E and further increase the vitamin E content of the concentrate. The so-called molecular distillation is a continuous distillation process in which liquid-liqu...

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Abstract

The invention relates to an atmospheric pressure low temperature distillation and rectification process which is characterized in that gas carrier is used, material to be separated and the gas carrier are heated and the gas carrier and the material are kept in touch; and the gas carrier and the material flow relatively. Therefore, the invention can realize the distillation and rectification process of material at low temperature under different pressures and can realize the distillation process of material which can not be distilled through reduced pressure distillation, the application rangeof the invention is very wide, the product quality can reach the effect of molecular distillation, and the rectification process can be realized but the production cost is very low.

Description

technical field [0001] The invention relates to a separation process and belongs to the field of chemical engineering. The process can realize the distillation and rectification process for all materials with volatile properties (including substances with little volatility), and is especially suitable for the separation of heat-sensitive and difficult-to-volatile materials. The invention is a separation method and belongs to the field of chemical engineering . Background technique [0002] We know that when a glass of water is placed in the air with low humidity, the water will slowly volatilize. This is because there is a saturated vapor pressure on the surface of the water, that is to say, there is a saturated concentration of water vapor, which is greater than the water vapor in the air. Partial pressure, so the surface water vapor concentration of water is greater than the concentration of water vapor in the air. The existence of this concentration difference makes wate...

Claims

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Application Information

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IPC IPC(8): B01D3/38
Inventor 伍运洪
Owner 伍运洪