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Olefin purification adsorbent and method thereof for olefin purification technology

A technology for adsorbents and olefins, applied in chemical instruments and methods, adsorption purification/separation, alkali metal oxides/hydroxides, etc., can solve the problem of easy carbon deposition in adsorbent regeneration, high rectification operating costs, and large grains and other problems, to achieve the effects of reducing impurities in olefins and their oxygenates, high molding strength, and simple process operation

Active Publication Date: 2014-01-08
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to solve the problem of high operating cost of rectification when removing trace oxygen-containing compounds in olefin streams, and at the same time overcome the problem that existing molecular sieve adsorbents are prone to carbon deposition due to large crystal grains and long channels. Disadvantages, develop a high-performance olefin purification adsorbent and its purification process, reduce purification operation costs, and achieve the purpose of protecting olefin catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Sorbent preparation

[0036] Put kaolin, 0.3 micron 13X molecular sieve powder, 5A molecular sieve powder and activated alumina into the disc rolling machine according to the weight ratio of 20%: 30%: 15%: 35%, and add carbonic acid with a concentration of 10wt% in the form of spray Sodium solution, rolling ball molding, sintering at 400-450°C for 1-4 hours to obtain a sample.

Embodiment 2

[0038] Sorbent preparation

[0039] Put kaolin, 0.7 micron 13X molecular sieve powder, Y-type molecular sieve and activated alumina into the disc rolling machine at the same time according to the weight ratio of 25%: 25%: 10%: 40%, and add carbonic acid with a concentration of 15wt% in the form of spray Sodium hydrogen solution, ball forming, calcination at 400-450°C for 1-4 hours, to obtain samples.

Embodiment 3

[0041] Desorption of Methanol, Dimethyl Ether and Propionaldehyde in Gas Phase in Propylene Gas

[0042] A certain amount of adsorbent is charged into the reactor respectively. at about 500h －1 Activation at 200°C for 2-4h under the flow of high-purity nitrogen with volumetric space velocity (GHSV), and then cooled to 25°C. Propylene gas (containing 100ppm methanol, 100ppm dimethyl ether DME, 100ppm propionaldehyde) for 1.8h －1 The mass space velocity (WHSV) and the pressure of 0.2MPa are continuously fed, and the content of methanol, dimethyl ether and propionaldehyde in the adsorbed tail gas is detected online by gas chromatography. After 90 hours of operation, the impurities of oxygen-containing compounds such as dimethyl ether in the tail gas The content is always below 1ppm.

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Abstract

The invention provides an olefin purification adsorbent and a method thereof for an olefin purification technology, relating to a method for removing trace of methyl alcohol, dimethyl ether and propionaldehyde from olefin material flow. According to the method, a microballoon adsorbent with certain size distribution is prepared by taking kaolin as an inert matrix, aluminum oxide or inorganic silicon-aluminum mixture as an adhesive, and submicron molecular sieve as an active component; under a gaseous phase or liquid phase working condition, the method is used for removing oxy-compound in olefin material flow by a high pressure low temperature adsorption and low pressure high temperature regeneration technology, so that the contents of components of the oxy-compound in the purified olefin product material flow are less than 1ppm (weight ratio), less ethylene and propylene components are lost, the requirements of the olefin purification technology on low pressure drop and large airspeed liquid phase operation are met, and the method can be used in industrial production.

Description

technical field [0001] The present invention relates to an olefin purification adsorbent, more specifically, the present invention relates to an olefin purification adsorbent and a method for the olefin purification process. Background technique [0002] Under the situation of increasingly scarce oil resources, coal-to-Olefins (MTO) technology has opened up a second raw material route for olefin production and has attracted widespread attention. With the industrialization of the coal-based methanol-to-olefins process and the general trend of energy structure adjustment, the diversity of olefin sources is gradually emerging, which objectively leads to an increase in the types of impurities in olefins. In the MTO process, due to the characteristics of the reaction process, there are unconverted ppm-level methanol and dimethyl ether in the olefin stream, as well as ppm-level propionaldehyde added in the olefin separation unit. The existence of these impurities affects the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C07C7/13C07C11/04C07C11/06C07C11/08
Inventor 徐华胜胡杰王鹏飞何秋平李豫晨叶丽萍张荣孙蕴婕李帅
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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