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Process method for producing ethylene by hydrogenation of calcium carbide gas from semi-coke through calcium carbide

A process method, calcium carbide gas technology, applied in the field of coal chemical industry, can solve the problems of small and medium-sized enterprises and areas short of water, long technical process, complicated process, etc., to extend the product industry chain, overcome the long process process, and increase the number of enterprises benefit effect

Active Publication Date: 2015-09-09
榆林科大高新能源研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technological process is long, complicated, and requires a large investment, especially for water, which makes it impossible for small and medium-sized enterprises and water-deficient areas to carry out

Method used

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  • Process method for producing ethylene by hydrogenation of calcium carbide gas from semi-coke through calcium carbide
  • Process method for producing ethylene by hydrogenation of calcium carbide gas from semi-coke through calcium carbide
  • Process method for producing ethylene by hydrogenation of calcium carbide gas from semi-coke through calcium carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The main composition of the raw material semi-coke in this example is shown in the following table: (4000kg / h semi-coke, temperature 40°C)

[0030]

[0031] Step 1: Produce calcium carbide using a closed calcium carbide furnace production process:

[0032] After the semi-coke is dried and screened, the moisture content of the semi-coke is reduced to 1% by mass, and the particle size is controlled at 5-10mm; it is mixed with lime powder at a mass ratio of 0.65:1, and then enters a closed calcium carbide furnace for reaction , the calcium carbide furnace is cooled and purified for use; the tail gas of the calcium carbide furnace is obtained by pressure swing adsorption (PSA), and the remaining gas is returned to the closed calcium carbide furnace as fuel; the obtained calcium carbide is 5714.286kg / h.

[0033] Step 2: Calcium Calcium Gas Acquisition:

[0034] The calcium carbide obtained in step 1 and water are mixed in the calcium carbide generator at a mass ratio of ...

Embodiment 2

[0039] The main composition of the raw material semi-coke in this example is shown in the following table: (4000kg / h semi-coke, temperature 40°C)

[0040]

[0041] Step 1: Produce calcium carbide using a closed calcium carbide furnace production process:

[0042] After the semi-coke is dried and screened, the moisture content of the semi-coke is reduced to 1% by mass, and the particle size is controlled at 10-20mm; it is mixed with lime powder at a mass ratio of 0.65:1, and then enters a closed calcium carbide furnace for reaction , the calcium carbide furnace is cooled and purified for use; the tail gas of the calcium carbide furnace is obtained by pressure swing adsorption (PSA), and the remaining gas is returned to the closed calcium carbide furnace as fuel; the obtained calcium carbide is 6153.846kg / h.

[0043] Step 2: Calcium Calcium Gas Acquisition:

[0044] The calcium carbide obtained in step 1 and water are mixed in the calcium carbide generator at a mass ratio of...

Embodiment 3

[0049] The main composition of the raw material semi-coke in this example is shown in the following table: (4000kg / h semi-coke, temperature 40°C)

[0050]

[0051] Step 1: Produce calcium carbide using a closed calcium carbide furnace production process:

[0052] The semi-coke is dried and sieved to reduce the water content of the semi-coke to 1% by mass, and the particle size is controlled at 20-25mm; it is mixed with lime powder at a mass ratio of 0.65:1, and then enters a closed calcium carbide furnace for reaction , the calcium carbide furnace is cooled and purified for use; the tail gas of the calcium carbide furnace is obtained by pressure swing adsorption (PSA), and the remaining gas is returned to the closed calcium carbide furnace as fuel; the obtained calcium carbide is 6666.667kg / h.

[0053] Step 2: Calcium Calcium Gas Acquisition:

[0054] The calcium carbide obtained in step 1 and water are mixed in the calcium carbide generator at a mass ratio of 4.2-4.8:1 fo...

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Abstract

The invention relates to a process method for obtaining acetylene gas from semi-coke via calcium carbide and further producing ethylene by hydrogenation. A process for producing methanol or dimethyl ether from coal-based or natural gas-based synthetic gas and further producing low-carbon olefins mainly comprising ethylene and propylene has the disadvantages of long process flow, complex process and large investment. The process method provided by the invention comprises the steps of drying and screening semi-coke, then mixing with lime powder, producing calcium carbide in a closed calcium carbide furnace and obtaining hydrogen from tail gas of the calcium carbide furnace through PSA; enabling obtained calcium carbide to react with water to produce acetylene gas; mixing acetylene gas with hydrogen according to a proportion, then compressing, entering an acetylene gas hydrogenation reactor, performing acetylene gas hydrogenation reaction under the action of a palladium-series silver-added additive catalyst, cooling the gas after reaction and then purifying through a rectification device to obtain ethylene gas. According to the ethylene production process provided by the invention, the supply-demand contradiction of semi-coke and calcium carbide can be relieved, the range of industrial applications of semi-coke and calcium carbide is expanded, the ethylene production method is enriched and the shortcomings of long process flow, high investment and large water demand of the existing ethylene production method are overcome.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a process method for producing ethylene by hydrogenating calcium carbide gas obtained from semi-coke through calcium carbide. Background technique [0002] Semi-coke, also known as semi-coke, is a high-quality coke produced from high-quality Jurassic non-caking coal and weakly caking coal through medium-low temperature dry distillation (600-800°C) process. Semi-coke products are widely used in calcium carbide, ferroalloy , Fertilizer gas production, pig iron smelting, blast furnace injection and other production fields and clean coal for urban residents. In the main consumption fields of semi-coke in my country, the consumption of calcium carbide accounts for more than 80% of the total consumption of semi-coke, and the total consumption of other fields does not exceed 20%. At present, my country has formed a semi-coke production capacity of about 70 mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C5/09C01B31/32C07C11/24C07C1/00C01B32/942
Inventor 董永波高航高光耀郭海洋
Owner 榆林科大高新能源研究院有限公司
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