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Composition for purifying tail gas of grain dryer based on activated carbon modification and its preparation method and application

A technology of activated carbon and drying machine, which is applied in chemical instruments and methods, separation methods, gas treatment, etc. It can solve the problems of unsatisfactory tail gas treatment, difficulty in completely clearing dust particles, and unresolved exhaust gas, etc., and achieves excellent results. Purification ability, excellent absorption ability, easy to promote the effect

Active Publication Date: 2018-09-04
江苏热风环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This exhaust gas treatment method not only requires a large space and equipment, but also the effect of exhaust gas treatment is not very ideal. On the one hand, it is difficult to completely clear the dust particles; produced carbon monoxide) has not been resolved

Method used

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  • Composition for purifying tail gas of grain dryer based on activated carbon modification and its preparation method and application

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preparation example Construction

[0015] The invention provides a method for preparing a composition based on activated carbon modification for purifying the tail gas of a grain dryer, the preparation method comprising:

[0016] 1) In the presence of protective gas, the bentonite is calcined to obtain bentonite powder;

[0017] 2) placing activated carbon powder, wheat bran powder, fly ash and bentonite powder in an acid solution for activation treatment to obtain an activation mixture;

[0018] 3) MDI (4,4,-diphenylmethane diisocyanate), TDI (toluene diisocyanate), polyether polyol, activated carbon, potassium fluotitanate and the activated mixture are contacted in the presence of ultrasonic waves to obtain foaming resin;

[0019] 4) Pulverizing the foaming resin to obtain foaming resin powder, and then mixing anionic surfactant, water and foaming resin powder to prepare a composition for purifying grain dryer tail gas based on activated carbon modification.

[0020] In step 1) of the above-mentioned prepar...

Embodiment 1

[0036] 1) In the presence of protective gas (nitrogen), the bentonite was calcined at 430° C. for 5 hours to obtain bentonite powder (particle size below 10 μm);

[0037] 2) Mix activated carbon powder (below 10 μm in particle size), wheat bran powder (below 10 μm in particle size), fly ash (below 10 μm in particle size), bentonite powder and acid solution (pH 4) according to 100:22:15:45 : mixed at a weight ratio of 400, and activated at 48°C for 1.2h to obtain an activated mixture;

[0038] 3) MDI, TDI, polyether polyol (brand L61), activated carbon, potassium fluorotitanate and the activation mixture are mixed according to the weight ratio of 100:19:120:39:1.1:28 in the presence of ultrasonic waves with a frequency of 25MHz and Carry out a contact reaction at 75°C for 8 hours to obtain a foamed resin;

[0039] 4) Pulverize the foaming resin to obtain foaming resin powder (below 10 microns), then mix anionic surfactant (sodium lauryl sulfate), water and foaming resin powder...

Embodiment 2

[0041]1) In the presence of protective gas (neon gas), calcining bentonite at 420°C for 4 hours to obtain bentonite powder (particle size below 10 μm);

[0042] 2) Mix activated carbon powder (below 10 μm in particle size), wheat bran powder (below 10 μm in particle size), fly ash (below 10 μm in particle size), bentonite powder and acid solution (pH 3.5) according to 100:20:12:35 : mixed at a weight ratio of 300, and activated at 45°C for 1 hour to obtain an activated mixture;

[0043] 3) MDI, TDI, polyether polyol (brand L64), activated carbon, potassium fluorotitanate and activation mixture according to the weight ratio of 100:15:110:34:0.8:22 in the presence of ultrasonic waves with a frequency of 20MHz and Carry out a contact reaction at 60°C for 6 hours to obtain a foamed resin;

[0044] 4) Pulverize the foaming resin to obtain foaming resin powder (below 10 microns), then mix anionic surfactant (sodium lauryl sulfate), water and foaming resin powder in a weight ratio o...

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Abstract

The invention discloses a combination based on activated carbon modification and used for purifying tail gas of a grain dryer and a preparation method and application thereof. The preparation method includes: 1), at presence of protection gas, calcining bentonite to obtain bentonite powder; 2), putting activated carbon powder, wheat bran powder, fly ash and the bentonite powder into an acid liquid for activation to obtain an activated mixture; 3), enabling MDI, TDI, polyether polyol, activated carbon and potassium fluotitanate to be in contact reaction with the activated mixture at presence of ultrasonic waves to obtain foamed resin; 4), smashing the foamed resin to obtain foamed resin powder, and mixing cationic surfactant and water with the foamed resin powder to obtain the combination. The combination prepared by the method has excellent capability of purifying the tail gas, and the preparation method is simple to operate and easy-to-get in raw material.

Description

technical field [0001] The invention relates to a composition for purifying the tail gas of a grain dryer, in particular to a composition for purifying the tail gas of a grain dryer based on activated carbon modification and its preparation method and application. Background technique [0002] The grain dryer is an assembly of a dryer. It is a general term for various equipment of grain dryer. According to the relative movement direction of the grain and the airflow, the dryer can be divided into cross-flow, mixed-flow, forward-flow, counter-current and forward-counter-current, mixed-counter-current, forward-mixed-flow and other types. The working principle of the grain dryer is: first, the air is heated into hot air by the heating device, and then the hot air is passed into the grain to heat the grain. [0003] After the grain heating is completed, the exhaust gas after the hot air cooling contains a large amount of dust particles and the exhaust gas produced by the grain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/26B01D53/02
CPCB01D53/02B01D2253/25B01D2253/304B01D2256/20B01D2258/02B01J20/20B01J20/262B01J2220/46B01J2220/4806B01J2220/4812B01J2220/4825
Inventor 萧鲲
Owner 江苏热风环保科技有限公司
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