Drying equipment and drying method

A drying equipment and drying method technology, applied in the field of printing and dyeing auxiliaries, can solve problems such as danger, and achieve the effects of easy operation, avoiding contact and avoiding waste

Active Publication Date: 2022-04-12
ZHEJIANG JIACHENG CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the characteristics of sodium hydrosulfite decomposing with water and releasing a large amount of heat, it is necessary to strictly control the contact between sodium hydrosulfite and water in production; when the hydrosulfite is drying, the heat source of the rotary drying kettle is hot water, and if water leakage occurs, it will cause irreparable damage. Loss, so the drying process of sodium bicarbonate is also a very dangerous process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] 2600 kg of sodium formate is dissolved in methanol 3M 3 And mother liquor 8m 3 Medium, material A; 3M of sodium sulfite and 3m sodium sulfate 3 Mix, then adopt sulfur dioxide 800 kg to prepare material B; mix the material A and the material B slowly mixed, and the mixture is mixed, and the sulfur dioxide is 1500 kg, and the ethane is 110 kg as the reaction inhibitor, temperature at 84 ° C. The reaction was carried out under pressure at 0.2 MPa to obtain an insurance powder.

[0082] Such as figure 2 As shown, the synthesized insurance powder is in a material, cooled to 65 ° C, transported with nitrogen, according to 1M 3 The speed of the / h continuously presss in the automatic sleeve centrifuge, dry and 1M 3 After washing of the methanol of / h, the spiral conveyor was fed into the spray tower, and after the solid material in the spray tower was converted from the hot nitrogen gas of about 64 ° C, the nitrogen gas was evaporated together with the methanol in the solid mate...

Embodiment 2

[0086] 2600 kg of sodium formate is dissolved in methanol 3M 3 And mother liquor 8m 3 Medium, material A; 3M of sodium sulfite and 3m sodium sulfate 3 Mix, then adopt sulfur dioxide 800 kg to prepare material B; mix the material A and the material B slowly mixed, and the mixture is mixed, and the sulfur dioxide is 1500 kg, and the ethane is 110 kg as the reaction inhibitor, temperature at 84 ° C. The reaction was carried out under pressure at 0.2 MPa to obtain an insurance powder.

[0087] Such as figure 2 As shown, the synthesized insurance powder is in a material, cooled to 75 ° C, transported with nitrogen, and press 2M. 3 The speed of / h continuously in the automatic filter, continued to use 2M after pressure drying 3 After washing of the methanol of / h, the spiral conveyor was fed into the spray tower, and after the solid material in the spray tower was converted from the hot nitrogen gas of about 64 ° C, the nitrogen gas was evaporated together with the methanol in the sol...

Embodiment 3

[0091] 2600 kg of sodium formate is dissolved in methanol 3M 3 And mother liquor 8m 3 Medium, material A; 3M of sodium sulfite and 3m sodium sulfate 3Mix, then adopt sulfur dioxide 800 kg to prepare material B; mix the material A and the material B slowly mixed, and the mixture is mixed, and the sulfur dioxide is 1500 kg, and the ethane is 110 kg as the reaction inhibitor, temperature at 84 ° C. The reaction was carried out under pressure at 0.2 MPa to obtain an insurance powder.

[0092] Such as figure 2 As shown, the synthesized insurance powder is in a material, cooled to 70 ° C, transported with nitrogen, according to 4M 3 The speed of / h continuously in the automatic filter, continue to use 4M after pressure drying 3 After washing of the methanol of / h, the spiral conveyor was fed into the spray tower, and after the solid material in the spray tower was converted from the hot nitrogen gas of about 64 ° C, the nitrogen gas was evaporated together with the methanol in the sol...

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Abstract

The invention provides drying equipment and a drying method. The drying equipment comprises a separation system, a drying system and an optional mixing system, and the separation system is used for performing solid-liquid separation on the sodium hydrosulfite synthetic material to obtain a solid separation product; the drying system is communicated with the separation system and is used for drying the solid separation product to obtain a dried product; and the mixing system is communicated with the drying system, and is used for mixing sodium sulfate and / or sodium carbonate with the drying product to obtain a sodium hydrosulfite product. By means of the drying equipment, the problem that sodium hydrosulfite makes contact with water can be solved from the source, and meanwhile the emission amount of waste gas is greatly reduced.

Description

Technical field [0001] The present invention relates to a drying apparatus and a drying method, and more particularly to a drying apparatus and a drying method of an insurance powder, which belongs to the field of printing additives. Background technique [0002] Insurance powder, the sodium sodium sulfate, is an inorganic chemical raw material, and the chemical formula is NA. 2 S 2 O 4 It is a white sand crystalline or pale yellow powder chemical product, melting point 300 ° C (decomposition), a piranate temperature of 250 ° C, insoluble in ethanol, dissolved in sodium hydroxide solution, and a strong reaction in metoff and combustion. The nature of the aqueous solution is unstable, which is extremely reduced, which is a strong reducing agent; it is easy to absorb oxygen in the air, and it is also easy to absorb moisture and evaporated. Sour. It is mainly used in the printing and dyeing industry, the pharmaceutical industry, papermaking bleach, clay bleach, food additives, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B17/10F26B21/14F26B25/00
Inventor 阮伟兴阮小萍赵伟明叶华明丁兴成
Owner ZHEJIANG JIACHENG CHEM
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