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Drying process and drying system for material containing low-boiling point, inflammable and explosive organic solvent

A flammable, explosive, organic solvent technology, applied in the direction of drying solid materials, non-progressive dryers, heating to dry solid materials, etc., can solve the problem of insufficient solvent recovery, low solvent recovery rate, pipeline blockage, etc. To avoid solvent loss and environmental pollution, improve solvent recovery rate, and reduce large flow erosion

Inactive Publication Date: 2010-03-10
ZIBO MINING GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Insufficient drying of materials, especially for materials with small particle size and high viscosity, the solvent cannot be fully recovered, and the solvent recovery rate is less than 95%
[0004] 2. If the ordinary external circulation vacuum system is used, the solvent loss is relatively large. If the dry material is powdery, the solvent will carry a large amount of dust into the pipeline during the drying process, and eventually the pipeline will be blocked.
[0005] 3. If the solvent is a low boiling point, flammable and explosive organic solvent, it is easy to cause explosion when it is dried at high temperature or encounters air, which will bring safety hazards to industrial production

Method used

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  • Drying process and drying system for material containing low-boiling point, inflammable and explosive organic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] with granularity as Zinc oxide, which contains 50% methanol as raw material, is dried and solvent recovered.

[0036] The zinc oxide wet material enters the dryer 2 at a rate of 10Kg / h, and the drying temperature is 105-110°C. After a residence time of 50-60 minutes, the dried zinc oxide material enters the following condenser 3 for cooling to 20 -25°C discharge, the bottom is filled with an appropriate amount of inert gas for protection. During the whole drying process, the vacuum degree is kept between 0.02-0.03Mpa by controlling the power of jet pump 7 . The solvent recovery rate is 99.5%, and the solvent content in the dried material is 0.5%. No blockage of the pipeline was found, and the solvent only carried a small amount of dust, which was recovered after passing through the spray tower.

[0037] It can be seen from experiments that the method significantly improves the solvent recovery rate and avoids solvent loss and environmental pollution. The amount of ...

Embodiment 2

[0039] Coal powder with a particle size of 0.05-400 μm containing 40% tetrahydrofuran is used as raw material for drying and solvent recovery.

[0040] The pulverized coal material enters the dryer 2 at an amount of 10Kg / h, and the drying temperature is 200-210°C. After a residence time of 55-60 minutes, the pulverized coal material enters the following condenser 3 for cooling to 20-20- The material is discharged at 25°C, and the bottom is filled with an appropriate amount of inert gas for protection. During the whole drying process, the vacuum degree is kept between 0.03-0.04 MPa by controlling the power of the jet pump 7 . After testing, the solvent content in the coal powder after drying is 0.4%, and the solvent recovery rate reaches 99.6%. No blockage of the pipeline was found, and the solvent only carried a small amount of dust, which was recovered after passing through the spray tower.

Embodiment 3

[0042] Use ordinary medium-temperature asphalt and 50% quinoline as raw materials for drying and solvent recovery. This kind of material has a relatively high viscosity during the drying process. With the ordinary drying process, the solvent recovery is relatively low, less than 90%. Spontaneous combustion, safety accidents occur, and cause environmental pollution. Adopting the process of the present invention, the wet material of ordinary medium-temperature asphalt containing 50% quinoline enters the dryer 2 at an amount of 10Kg / h, and the drying temperature is 280-285°C. After a residence time of 100 minutes, the medium-temperature after drying The bitumen enters the following condenser 3 to be cooled to 20-25°C and discharged, and the bottom is filled with an appropriate amount of inert gas for protection. During the whole drying process, the vacuum degree is kept between 0.4-0.5 MPa by controlling the power of the jet pump 7 . The solvent recovery rate is 99.8%, and the ...

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Abstract

The invention belongs to a drying process and a drying system for a material containing a low-boiling point, inflammable and explosive organic solvent, in particular to a drying process and a drying system for recovering solvents, such as ethanol, methanol, methylbenzene, benzene and the like. The drying process comprises the following steps: setting an airtight and explosion-proof drying system;conveying a wet material to a dryer continuously in a convey quantity of between 10 to 3000 kg; keeping the wet material for 30 to 120 minutes under protection of vacuum and inert atmosphere, and thenheating and drying the wet material at a temperature of between 100 to 300 DEG C so as to remove the solvents; cooling the material to a temperature of between 0 and 50 DEG C; and feeding the cooledmaterial to a material discharging system for discharging. The process and the system improve the solvent recovery rate, avoid potential safety hazard and environmental pollution which are caused by solvent loss, and reduce the entrainment amount of gas dust, and simultaneously reduce the probability of pipeline blockage obviously by large flow washout of a spray tower.

Description

technical field [0001] The invention belongs to a drying process and system for materials containing low boiling point, flammable and explosive organic solvents. It specifically involves the drying process and system for the recovery of solvents such as ethanol, methanol, tetrahydrofuran, acetone, quinoline, pyridine, furan, toluene, and benzene. Background technique [0002] At present, there are two types of drying methods for materials. One is that the drying medium is in direct contact with the materials and is dried by conduction, such as airflow drying, and the other is that the materials are dried by heating with a jacket. The drying process for solvent recovery materials is roughly as follows: wet materials enter the dryer, heat them through the heating system, and then use the ordinary method of external circulation vacuum system for solvent recovery. At present, the process has the following problems: [0003] 1. Insufficient drying of materials, especially for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B7/00F26B11/18F26B11/00F26B5/04F26B3/00
Inventor 向柠王凤生董凤波廖虎李鹤
Owner ZIBO MINING GRP
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