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Online analyzing method and device for product of ethylene reaction by biological ethanol dehydration

A bio-ethanol and reaction product technology, applied in measurement devices, analytical materials, material separation, etc., can solve the problems of long analysis time, high labor intensity, cumbersome and other problems, and achieve long analysis time, fast analysis speed, and high labor intensity. Effect

Active Publication Date: 2010-12-08
GUANGXI RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This operation has the characteristics of cumbersome, labor-intensive, long analysis time, large error, and inability to know the composition state of the reaction product in time.

Method used

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  • Online analyzing method and device for product of ethylene reaction by biological ethanol dehydration
  • Online analyzing method and device for product of ethylene reaction by biological ethanol dehydration
  • Online analyzing method and device for product of ethylene reaction by biological ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example is the initial stage of the reaction, and there are more by-products at this time, refer to the attached figure 1 , the gas chromatograph used is SP-6890 gas chromatograph, and the delivery sample system between the reaction tower 2 and the six-way sampling valve 8 is installed with a three-way 4 and a gas path heating belt 6, and the six-way sampling valve 8 is placed in an insulated In the device 10 , the chromatographic column 11 is a stainless steel chromatographic column (2m×ф4mm, filled with GDX104 stationary phase), and the detector is a thermal conductivity cell detector 12 . The material is input by the infusion pump from the feed part 1 from the top of the reaction tower 2, and the gaseous product generated flows out from the bottom of the tower 3, and a tee 4 is installed on the gas path flowing to the ethylene product collector, and most of it enters the product collection system 5; at the same time A small part enters the chromatographic analys...

Embodiment 2

[0038] This example is product monitoring analysis, and this moment by product is less, mainly is product quality control analysis, and chromatographic operating condition is the same as embodiment 1, and what changed is only following condition:

[0039] Column head pressure: 0.4MPa, column temperature 110°C, vaporization temperature 150°C, TCD detector temperature 250°C, carrier gas is high purity

[0040] Nitrogen gas with a nitrogen flow rate of 60mL / min and a detector bridge current of 100mA.

[0041] Split injector, split ratio: 50:1

[0042] Separation chromatogram see figure 2 .

[0043] by chromatography figure 2 and chromatography image 3 It can be seen that under the chromatographic conditions of the present invention, each component is well separated and the peak shape is symmetrical, which is completely suitable for gas chromatography on-line analysis of bioethanol catalytic dehydration to ethylene.

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Abstract

The invention provides a gas chromatography online analyzing method and a device for a product of an ethylene reaction by biological ethanol dehydration. The method is to divide the product of the ethylene reaction by the biological ethanol dehydration into two paths, one path enters a product collection device; the other path enters a chromatographic column through carrier gas, wherein when the temperature is in a range of between 80 and 150 DEG C, ethylene, water, acetaldehyde, ethanol, ether and acetone are separated by the chromatographic column; and the separated components are introduced into a thermal conductivity cell detector, the contents of the ethylene, the water, the acetaldehyde, the ethanol, the ether, the acetone and other side products are detected at the temperature of between 200 and 250 DEG C. The method overcomes the defects that, in the conventional analyzing technology, the product generated after the biological ethanol dehydration has complicated operation and large labor intensity, the reacting status cannot be observed in time and the like. The response values of the components to be detected can be close in the chromatographic condition, and relative mass percentages of the components are approximate to the mass percentages of the components by using the area normalization method, so the qualitative measurement on the ethylene, the water, the acetaldehyde, the ethanol, the ether and the acetone can be completed in one time, the method can be used for automatic online analysis of the ethylene reaction by the biological ethanol dehydration.

Description

technical field [0001] The invention relates to an analysis method of chemical components in the reaction process of the chemical industry production process, in particular to an analysis method and device for the reaction product of ethanol dehydration to ethylene. Background technique [0002] Ethylene is an important basic chemical raw material. 75% of petrochemical products use ethylene as raw material. Before the 1940s, almost all ethylene was produced by dehydration of ethanol. Later, due to the development of petrochemical industry, a large amount of cheap oil promoted the cracking of hydrocarbons. Ethylene has replaced the ethylene produced by ethanol dehydration with its economic advantages. In the 1970s, with the sustained and rapid development of the social economy, the demand for ethylene increased day by day, but the most basic raw material for the ethylene industry was gradually depleted. As oil is a non-renewable resource and its price has skyrocketed, ethyle...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/60
Inventor 韦志明覃兰华张守利徐燕黄科润黄平莫炳荣黄科林陈远霞穆允玲
Owner GUANGXI RES INST OF CHEM IND CO LTD
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