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Method and device for purifying and regenerating hot potash solution of Fischer-Tropsch synthesis tail gas and application

A purification and regeneration device and a Fischer-Tropsch synthesis technology are applied in the field of purification and regeneration of hot potash alkali solution of Fischer-Tropsch synthesis tail gas, and purification and regeneration of hot potash alkali solution after decarbonization of Fischer-Tropsch synthesis tail gas, which can solve safety accidents, complicated operations, The problems such as low utilization rate of material energy can achieve the effect of improving the use efficiency, solving the high loss and reducing the production and operation cost.

Active Publication Date: 2021-11-05
陕西未来能源化工有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0007] After decarburization of the tail gas produced by the existing Fischer-Tropsch synthesis, the hot potash solution contains too many organic components, which not only cannot be repeated and recycled, but also easily leads to safety accidents, and the hot potash solution needs to be replaced, which is cumbersome and wastes materials. , energy utilization rate is low, in order to solve these problems, the present invention proposes a kind of Fischer-Tropsch synthesis tail gas hot potash solution purification regeneration method and its device and application, by drying the hot potash solution after decarburization first, remove Solvent, then roasted to remove organic components, realize the purification of potassium carbonate, and at the same time, condense the steam generated in the drying process, mix it with carbonation, and reuse it for the decarbonization step in the Fischer-Tropsch synthesis reaction, and the heat collected by condensation can be used to purify and regenerate carbonic acid The heating of potassium solution realizes the dual utilization of materials and energy, and at the same time ensures the efficiency of decarbonization and purification, which is of great significance for industrial production

Method used

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  • Method and device for purifying and regenerating hot potash solution of Fischer-Tropsch synthesis tail gas and application
  • Method and device for purifying and regenerating hot potash solution of Fischer-Tropsch synthesis tail gas and application
  • Method and device for purifying and regenerating hot potash solution of Fischer-Tropsch synthesis tail gas and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a method for purifying and regenerating hot potassium-alkali solution of Fischer-Tropsch synthesis tail gas, which includes: sending the decarburized hot potassium-alkali solution into an evaporation crystallization device, under an absolute pressure of 20kPa and a solution heating temperature of 100°C Crystallized by evaporation to obtain K 2 CO 3 、KHCO 3 and CH 3 COOK, C 2 h 5 Solid mixed potassium salt composed of organic acid potassium such as COOK. The steam condensate obtained after condensing the steam formed by evaporation and crystallization is recycled. The obtained solid mixed potassium salt enters the screw conveyor of the electrothermal roasting and cooling furnace. The screw conveyor pushes the material into the preheating section. After preheating, the material enters the roasting section. Moisture and volatile matter in high-temperature gasification materials at 650°C under pressure conditions. The time that the material s...

Embodiment 2

[0052] The hot potassium alkali solution (mainly potassium carbonate solution containing KHCO 3 and CH 3 COOK, C 2 h 5 COOK and other organic acid potassium solutions) are pumped into the spray drying device, and spray-dried with hot air at 180°C, so that the solution is dehydrated and dried until the water content is less than 1%, and K 2 CO 3 、KHCO 3 and CH 3 COOK, C 2 h 5 Solid mixed potassium salt composed of organic acid potassium such as COOK. The steam condensate obtained after the steam formed by spray drying is condensed is recycled. The obtained solid mixed potassium salt enters the screw conveyor of the electrothermal roasting and cooling furnace. The screw conveyor pushes the material into the preheating section. After preheating, the material enters the roasting section. Moisture and volatile matter in 600°C high-temperature gasification materials under pressure conditions. The time that the material stays in the roasting section is 60 minutes. The roas...

Embodiment 3

[0054] The difference from Example 2 is that the solid mixed potassium salt was calcined at 300°C, 400°C, 500°C, 650°C, 700°C, 750°C and 800°C for 60 minutes at each constant temperature. All the other operations are the same as in Example 2.

[0055] Performance Testing

[0056] 1. Sample weight loss test

[0057] Measure 50mL of decarburized sample solution (hot potassium alkali solution after decarburization) into a pre-dried and weighed crucible, spray dry with hot air at 180°C until there is no flowing liquid, and record the initial sample solution quality and after roasting After the total mass of the crucible and the sample liquid is put into the muffle furnace and roasted at 300°C, 400°C, 500°C, 600°C, 650°C, 700°C, 750°C and 800°C for 1 hour, observe the Change the situation and weigh its quality, and calculate the weight loss under different temperatures, as shown in Table 1.

[0058] Table 1 Sample weight loss under different temperatures

[0059]

[0060] No...

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Abstract

The invention relates to the technical field of Fischer-Tropsch synthesis, and aims to solve the problems that after tail gas generated by existing Fischer-Tropsch synthesis is decarbonized, a hot potash solution contains excessive organic matter components and cannot be repeatedly and circularly used, safety accidents are easily caused, the hot potash solution needs to be replaced, the operation is tedious, and the utilization rate of materials and energy is low. In order to solve the problems, the invention provides a method and a device for purifying and regenerating a hot potash solution of Fischer-Tropsch synthesis tail gas and application of the method. The decarbonized hot potash solution is dried, a solvent is removed, organic matter components are removed through roasting, potassium carbonate is purified, meanwhile, steam generated in the drying process is condensed and mixed with carbonation for reuse in the Fischer-Tropsch synthesis reaction. Heat collected by condensation can be used for heating a purified and regenerated potassium carbonate solution, so that dual utilization of materials and energy is realized, meanwhile, the decarbonization and purification efficiency can be ensured, and the method has great significance in industrial production.

Description

technical field [0001] The present invention relates to the technical field of Fischer-Tropsch synthesis, in particular to a method for purifying and regenerating hot potassium-alkali solution of Fischer-Tropsch synthesis tail gas and its device and application, and more specifically to a method for purifying and regenerating hot potash-alkali solution after decarburization of Fischer-Tropsch synthesis tail gas Methods, devices and applications thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The Fischer-Tropsch synthesis process uses coal or natural gas as a raw material to indirectly synthesize liquid fuels. In the Fischer-Tropsch reaction, H 2 While CO and CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/62B01D53/77C10G2/00
CPCB01D53/96B01D53/62B01D53/77C10G2/32B01D2251/306B01D2251/606B01D2257/504B01D2258/02
Inventor 叶盛芳柳永兵张雨田佰起王帅立王广柱薛蓉张艳盖延浩
Owner 陕西未来能源化工有限公司
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