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Device and technology used for processing dry method calcium carbide residue and realizing acetylene gas recovery

A technology of carbide slag and acetylene gas, which is applied in the purification/separation of hydrocarbons, chemical instruments and methods, hydrocarbons, etc., can solve the problems of VOCs increase, waste of acetylene resources, environmental pollution, etc. With the precipitation process, it is convenient for storage and transportation

Pending Publication Date: 2018-09-14
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no acetylene gas recovery technology and equipment developed for dry carbide slag. In order to reduce production costs, enterprises usually adopt the direct discharge method, which not only causes a great waste of acetylene resources, but also the direct discharge of acetylene gas will lead to VOCs in the atmosphere. increase, resulting in environmental pollution and damage

Method used

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  • Device and technology used for processing dry method calcium carbide residue and realizing acetylene gas recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Fill the carbide slag from the dry acetylene generator into a glass tube with a radius of 2 cm and a height of 8 cm, and lightly tap the wall of the glass tube to make the carbide slag powder in the tube dense. The filling amount of the carbide slag powder is 75g. The lower part of the glass tube is provided with a material receiving plate and a gas distribution plate, and the CO at 100°C 2 The gas is passed into the tube at a flow rate of 0.5L / min to contact and react with carbide slag, and the gas flow and composition changes at the upper end of the glass tube are simultaneously detected. After ventilating for 2 hours, the reaction was ended, and the glass tube was disassembled to detect the solid content in the glass tube. It was found that part of the carbide slag was converted into calcium carbonate. The main components of the gas at the upper end of the glass tube were water vapor and carbon dioxide. The collected crude acetylene gas was about 0.07g .

Embodiment 2

[0039] Select the dry process carbide slag of the same batch as Example 1, fill it in a glass tube with a radius of 2 cm and a height of 8 cm, and gently tap the wall of the glass tube to make the carbide slag powder in the tube dense, and the carbide slag powder The loading amount of the material is still 75g. CO at 100°C 2 The gas is introduced into the calcium carbide slag layer through the gas distribution plate at a flow rate of 0.75 L / min to contact and react with it, and the reaction is completed after aeration for 1 hour. The collected crude acetylene gas is measured to be about 0.055 g.

Embodiment 3

[0041] according to figure 1 The shown device makes a fixed bed reactor 1, which has a diameter of 0.3m and a height of 0.5m, and the amount of dry carbide slag filled inside is 30 kg. The bottom of the fixed bed reactor 1 is provided with a gas distributor 4, which will be heated to 120 °CCO 2 The gas is introduced into the carbide slag pile from the gas distributor 4 of the fixed bed reactor 1, and the gas flow is controlled at 0.1Nm 3 / min, the amount of crude acetylene gas collected from the upper part of the reactor after 60 minutes of reaction is about 50g.

[0042] The preferred gas distributor 4 of the present invention adopts a variable-aperture gas distribution plate, and the apertures of the gas distribution holes on the gas distribution plate gradually become larger along the gas flow path to realize CO 2 Uniform distribution of gas.

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Abstract

The invention discloses a device and technology used for processing dry method calcium carbide residue and realizing acetylene gas recovery. The device comprises a fixed bed reactor; the upper part ofthe fixed bed reactor is provided with a material guide chamber, and the lower part is provided with a gas distributor; the gas distributor is communicated with a CO2 waste gas gas source; the bottomof the fixed bed reactor is provided with a discharging device; the fixed bed reactor is communicated with an acetylene separating equipment; the material guide chamber comprises a tapered cylinder,wherein the upper part of the tapered cylinder is larger than the lower part of the tapered cylinder; the bottom of the material guide chamber is provided with a channel used for introducing powder material into the lower part of the fixed bed reactor. The invention also discloses acetylene recovery technology. The technology used for processing dry method calcium carbide residue with CO2 is disclosed for the first time; CO2 is introduced into the device; calcium carbide residue powder is converted into calcium carbonate particles through reaction with CO2, so that the specific surface area ofthe solid calcium carbide residue is reduced greatly, desorption of the acetylene gas absorbed by the surface of the calcium carbide residue is realized, and low cost recovery of acetylene gas is realized.

Description

technical field [0001] The invention belongs to the field of acetylene gas recovery, and in particular relates to a device and a process for processing dry carbide slag to realize acetylene gas recovery. Background technique [0002] Polyvinyl chloride resin (PVC) is one of the five general-purpose resins in the world, and has been widely used in social life because of its outstanding cost performance. Carbide (CaC 2 ) through acetylene gas (C 2 h 2 ) The calcium carbide acetylene route for PVC production is the main technical solution for PVC production in my country due to its rich coal resources and simple and mature process. In 2016, the domestic PVC production of calcium carbide route exceeded 10 million tons, accounting for more than 70% of the total output. Acetylene is an intermediate product of PVC production and also the target product of calcium carbide hydrolysis. It has high economic value and the production cost is more than 7,000 yuan / ton. Calcium carbide ...

Claims

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Application Information

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IPC IPC(8): C07C7/148C07C7/12C07C11/24C01F11/18
CPCC01F11/18C07C7/12C07C7/14858C07C11/24
Inventor 陈刚徐婕杨小彦李瑶樊英杰
Owner SHAANXI COAL & CHEM TECH INST
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