Multi-effect evaporation concentration technology, multi-effect evaporation crystallization technology and multi-effect evaporation concentration device of solution containing sulfuric acid and sulfate

A multi-effect evaporation and evaporative crystallization technology, which is applied in the directions of multi-effect evaporation, solution crystallization, alkali metal sulfite/sulfate dehydration, etc., can solve the problems of low efficiency, high investment, and many equipments.

Active Publication Date: 2017-08-04
许达人 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process is an innovation based on flash evaporation. The shortcomings of flash evaporation itself, s

Method used

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  • Multi-effect evaporation concentration technology, multi-effect evaporation crystallization technology and multi-effect evaporation concentration device of solution containing sulfuric acid and sulfate
  • Multi-effect evaporation concentration technology, multi-effect evaporation crystallization technology and multi-effect evaporation concentration device of solution containing sulfuric acid and sulfate
  • Multi-effect evaporation concentration technology, multi-effect evaporation crystallization technology and multi-effect evaporation concentration device of solution containing sulfuric acid and sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] like figure 1 As shown, a multi-effect evaporation concentration device containing sulfuric acid and its salt solution, evaporating sulfuric acid and its salt solution into an acid bath, including 1-effect evaporator 1, 2-effect evaporator 2, 3-effect evaporator 3, 4-effect Evaporator 4, 5-effect evaporator 5, 6-effect evaporator 6, 1-6 effect circulation pump corresponding to 1-6 effect evaporator, 1-stage preheater 7 corresponding to 1-5 effect evaporator, 2nd stage preheater 8, 3rd stage preheater 9, 4th stage preheater 10, 5th stage preheater 11 and steam injection extractor 12;

[0214] The acid outlet pipe of the next stage preheater is connected with the acid inlet pipe of the upper stage preheater (for example, the acid outlet pipe 13 of the 5th stage preheater is connected with the acid inlet pipe 14 of the 4th stage preheater), 1 The acid outlet pipe 15 of the stage preheater is connected with the acid inlet pipe 16 of the first effect evaporator, and the aci...

Embodiment 2

[0224] like figure 2 As shown, a multi-effect evaporation crystallization device containing sulfuric acid and its salt solution, evaporating sulfuric acid and its salt solution is an acid bath, including a 1-effect evaporator 31, a 2-effect evaporator 32, a 3-effect evaporator 33 and a 4-effect evaporator Evaporator 34, 1-4 effect circulating pump corresponding to 1-4 effect evaporator, 1-stage preheater 35 corresponding to 1-4 effect evaporator, 2-stage preheater 36, 3-stage preheater 37 and 4-stage preheater 38, 5-effect evaporative crystallizer 39, and 6-effect evaporative crystallizer 40. The evaporative crystallizer is provided with an evaporative crystallization circulation pump, and the acid outlet pipe of the next stage preheater is connected to the upper stage The acid inlet pipe of the preheater is connected (for example, the acid outlet pipe 41 of the 4th stage preheater is communicated with the acid inlet pipe 42 of the 3rd stage preheater);

[0225] The acid out...

Embodiment 3

[0236] like image 3 As shown, a multi-effect evaporation and crystallization device containing sulfuric acid and its salt solution evaporates sulfuric acid and its salt solution—acidic water (including two baths), including a 1-effect evaporator 73, a 2-effect evaporator 74, and a 3-effect evaporator Evaporator 75, 4-effect evaporator 76, 5-effect evaporator 77, 6-effect evaporator 78, 7-effect evaporator crystallizer 79; 1-6 effect circulation pump corresponding to 1-6 effect evaporator, and 7-effect evaporator Evaporation and crystallization circulating pump corresponding to crystallizer 79, first-stage preheater 80 corresponding to 1-4 effect evaporators, second-stage preheater 81, third-stage preheater 82, fourth-stage preheater 83, and acid Bath preheater 84 .

[0237] The material flow is as follows: 80°C acidic water enters from the 4th-stage preheater 83, preheats to 109°C through the 4th, 3rd, 2nd, and 1st-stage preheaters, enters the 1-effect evaporator to evaporat...

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Abstract

The invention discloses a multi-effect evaporation concentration technology, a multi-effect evaporation crystallization technology and a multi-effect evaporation concentration device of a solution containing sulfuric acid and sulfate. The technologies and the device are characterized in that low-temperature-difference heat transfer flow evaporation is adopted; step-by-step secondary steam series preheating is adopted; an acid bath is led as an evaporation crystallization carrier; and last-effect or last-two-effect evaporation crystallization is adopted. The evaporation concentration and crystallization device mainly comprises (1-n)-effect evaporation crystallizers, (1-n)-effect circulating pumps, 1-(n-1)- or 1-(n-2)-stage preheaters, condensers and vacuum devices. According to the technologies and the device, a steam-water ratio of acid bath 5-7-effect evaporation crystallization reaches an advanced level of 0.17-0.19; a steam-water ratio of acid water and two-bath 6-8-effect evaporation crystallization reaches an advanced level of 0.13-0.15; a steam-water ratio of a low-concentration acid water 7-9-effect evaporation concentration device can further reach an advanced level of 0.09-0.11, but the state-of-the-art steam-water ratio of 16-stage flash evaporation crystallization is 0.255 in the current industry.

Description

technical field [0001] The invention relates to the evaporation recovery treatment of acid bath and acidic water (containing sulfuric acid and its salt solution) produced in viscose fiber production, specifically a multi-effect evaporation concentration process and evaporation crystallization process of sulfuric acid and its salt solution and devices. Background technique [0002] Spinning, coagulation, and washing processes in the viscose fiber production process are the main processes of fiber formation. During the process of fiber coagulation into silk and silk washing, the solution containing sulfuric acid and its salt mainly includes acid bath and acid water (including two baths). [0003] The recovery and treatment of acid bath, the traditional process is flash concentration, cooling and crystallization of Glauber's salt, and then roasting of Glauber's salt to anhydrous sodium sulfate for sale, high energy consumption, many equipment, many failures, and low yield of s...

Claims

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Application Information

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IPC IPC(8): B01D1/26B01D9/02C01D5/18
CPCB01D1/0082B01D1/26B01D9/004B01D9/0063C01D5/18B01D2009/0086
Inventor 许达人
Owner 许达人
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