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Spouted fluidized bed-fluidized bed composite reactor for producing hydrogen fluoride

A technology of spouted fluidized bed and fluidized bed reaction, which is applied in the fields of hydrogen fluoride, fluorine/hydrogen fluoride, chemical instruments and methods, etc., and can solve problems such as difficult recovery, channel short circuit, system collapse, etc.

Inactive Publication Date: 2017-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid phase in this process can also be other liquid phases, but the common problems in this process are that the liquid phase solvent is lost, recovery is difficult, and the cost is high
However, the moving bed reactor has extremely high requirements on the sphericity and fluidity of fluorite particles and calcium sulfate / fluorite composite particles, otherwise it will easily cause agglomeration, channeling and short circuit, which will lead to a decrease in conversion rate or even system collapse

Method used

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  • Spouted fluidized bed-fluidized bed composite reactor for producing hydrogen fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] use as figure 1 The shown spouted fluidized bed-fluidized bed composite reactor is used to produce hydrogen fluoride, and the composite reactor is mainly composed of a spouted fluidized bed 20 at the bottom of the reactor, a fluidized bed 19 at the upper part, and a gas circulation unit. The spouted fluidized bed 20 is composed of a straight tube section cylinder 17, a diameter-reducing section 23 below the cylinder, and an air inlet 22, while the fluidized bed 19 is composed of a straight tube section 16 and an enlarged section 6 above the straight tube section. There is a heating furnace 1 outside the composite reactor.

[0032] The circulation unit includes a cyclone separator 8, a condenser 9, a gas-liquid separator 10, a splitter 11, a liquid delivery pipeline 14, gas delivery pipelines 12, 13, and the like. The circulating gas flows out from the gas outlet at the top of the reactor, and the entrained fine powder particles are separated by the cyclone separator 8,...

Embodiment 2

[0035] The same spouted fluidized bed composite reactor as in Example 1 was used to produce hydrogen fluoride. The superficial fluidization velocity and other conditions of the injection zone and the annulus zone are kept consistent with that of Example 1. The following conditions are mainly changed: the molar ratio of fluorite particles to sulfur in the feed is 1.0:1, and the temperature range in the reactor is still 200-400°C.

[0036] After the above reaction process was carried out for 2 hours, the hydrogen fluoride content was analyzed through the flow splitter line 25, and the results are shown in Table 1.

Embodiment 3

[0038] Maintain the same reaction conditions as in the examples, such as reaction temperature, reaction pressure, molar ratio of fluorite particles to sulfur in the feed, and the like. Effective control of agglomeration in the spouted fluidized bed region is achieved by changing the flow ratio of the sprayed stream, the fluidized stream and the product hydrogen fluoride stream. The gas volume in the fluidized stream, that is, the annulus area, accounts for 30%-50% of the total gas volume at the bottom inlet, and the gas volume in the injection area is guaranteed to remain unchanged at 40%.

[0039] Under the conditions of different annulus gas volumes, after the reaction was carried out for 2 hours, calcium sulfate was sampled through pipeline 2 for 0.5 hours, and particles with an equivalent diameter of 50.6 μm100 μm are regarded as large agglomerates. The mass fraction wt% of various agglomerates was counted to characterize the regulating effect of the gas volume in the annu...

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Abstract

The invention discloses a spouted fluidized bed-fluidized bed composite reactor for producing hydrogen fluoride. The reactor comprises two reaction regions comprising a spouted fluidized bed and a fluidized bed, wherein a gas distribution plate and a solid blanking pipe are arranged between the two reaction regions; the lower part of the reactor is the spouted fluidized bed; the spouted fluidized bed comprises a straight tube section and a diameter reducing section part arranged under the straight tube section. In the spouted fluidized bed reaction region, the center spouted air flow quantity is great enough, so that the impact effect on the agglomeration is strong enough; the motion of particles in the position is violent; agglomeration cannot be easily generated. On one hand, the proportion of the annular gap region fluidized flows and the spouted region flows is increased, i.e., the transformer of the total air flow to the annular gap region fluidized flows is controlled; on the other hand, the circulation gas total flow rate is increased, so that the high flow rate of the fluidized flows is maintained; the particle motion of the annular gap region is enhanced, so that the agglomeration is regulated, controlled and eliminated.

Description

technical field [0001] The invention relates to a spouted fluidized bed reactor for continuous production of anhydrous hydrogen fluoride and its technology. Background technique [0002] Anhydrous hydrogen fluoride is an important basic chemical raw material, and its organic fluoride, inorganic fluoride salt and other products are widely used in fluorine chemical industry, petrochemical industry, atomic energy industry, etc. my country's fluorine resources mainly exist in the form of fluorite ore and phosphate rock, among which the basic reserves of fluorite rank first in the world, and fluorite is the main raw material for the production of hydrogen fluoride in my country. [0003] For a long time, fluorite (Ca 2 F) The rotary kiln process as raw material is the mainstream process for producing anhydrous hydrofluoric acid. The following reactions mainly occur in the rotary kiln reaction: [0004] CaF 2 +H 2 SO 4 →CaSO 4 +2HF [0005] The process is relatively mature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/38C01B7/19
CPCC01B7/192B01J8/1827B01J8/1836B01J8/388B01J2208/00256
Inventor 杨遥黄正梁刘仲玄孙婧元林王旻王靖岱阳永荣蒋斌波廖祖维范小强王浩同訾灿
Owner ZHEJIANG UNIV
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