Preparation method of modified alumina dehydrating agent

A technology of alumina and dehydrating agent, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve the problem of affecting the separation efficiency of chlorine and oxygen, the purity of chlorine gas cannot be reused for reaction, and adsorption drying cannot be used Dehydration technology and other issues to achieve the effect of large water absorption, stable operation, and long operating life

Active Publication Date: 2015-09-09
FININGS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current various adsorbents have poor acid resistance and poor selectivity, which makes it impossible to use adsorption drying and dehydration technology, and also affects the separation efficiency of pressure swing or temperature swing adsorption to separate chlorine and oxygen, and the purity of the separated chlorine cannot reach recovery For the purpose of reaction (the purity of chlorine gas used for reaction should be ≥99.5%)
[0016] In summary, the dehydration and drying technology of various chlorine-containing gas water-containing gas mixtures, the dehydration and drying technology of industrialization all adopt the dehydration and drying technology of concentrated sulfuric acid, and neither satisfactory

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  • Preparation method of modified alumina dehydrating agent

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Embodiment 1

[0035] A method for preparing a modified alumina dehydrating agent. After the macroporous aluminum glue, macroporous silica gel, calcium oxide, zinc oxide and Tianqing powder are uniformly blended, kneading, molding, dicing, primary drying, and primary roasting are performed in sequence. , impregnation, secondary drying, secondary roasting are made into finished products, and are used for the dehydration process before separating chlorine and oxygen from the mixed gas generated by hydrogen chloride catalytic oxidation reaction by adopting adsorption separation method; Aluminum glue: silica gel: calcium oxide: zinc oxide: The quality ratio of Tianqing powder is 70-82:7-14:0.5-2.0:5-10:5-10.

[0036] The physical properties of the modified alumina dehydrating agent are: the size is ф3~5×6mm, the bulk density is 0.6-0.7 kg / L, the strength is ≥5.0 N / mm, and the specific surface is ≥200 m 2 / g, pore volume ≥0.65ml / g, abrasion ≤5.0%.

[0037] The chemical composition of the modified ...

Embodiment 2

[0046] A preparation method of a modified alumina dehydrating agent, comprising: after uniformly blending aluminum glue, silica gel, calcium oxide, zinc oxide and Tianqing powder, kneading, molding, dicing, primary drying, primary roasting, and dipping in sequence , secondary drying, secondary roasting to make finished products, the mass ratio of aluminum glue: silica gel: calcium oxide: zinc oxide: Tianqing powder is 82:7:1:5:5.

[0047] In this embodiment, the chemical composition of the modified alumina dehydrating agent is: 75.0% Al 2 O 3 , 11.5% SiO 2 , 1.2% Na 2 O, 3.0% CaO, 9.0% ZnO, 0.3% impurities.

[0048] In this example, during the kneading process, deionized water was added to the mixture, and the mass of the deionized water added was 40% of the blend.

[0049] In this embodiment, in the pelletizing process, the extruded green body is cut into pellets with a size of Φ3×5mm.

[0050] In this embodiment, in the primary drying process, the drying temperature is ...

Embodiment 3

[0056] A preparation method of a modified alumina dehydrating agent, comprising: after uniformly blending aluminum glue, silica gel, calcium oxide, zinc oxide and Tianqing powder, kneading, molding, dicing, primary drying, primary roasting, and dipping in sequence , secondary drying, secondary roasting to make finished products, the mass ratio of aluminum glue: silica gel: calcium oxide: zinc oxide: Tianqing powder is 70:14:2.0:6:8.

[0057] In this embodiment, the chemical composition of the modified alumina dehydrating agent is: 82.0% Al 2 O 3 , 8.0% SiO 2 , 0.8% Na 2 O, 1.6% CaO, 7.4% ZnO, 0.2% impurities.

[0058] In this example, during the kneading process, deionized water was added to the mixture, and the mass of the deionized water added was 65% of the blend.

[0059] In this embodiment, in the pelletizing process, the extruded green body is cut into pellets with a size of Φ5×6mm.

[0060] In this embodiment, in the primary drying process, the drying temperature i...

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Abstract

The invention discloses a preparing method of a modified aluminum oxide dehydrant. The preparing method comprises the following steps: uniformly blending alumina gel, silica gel, calcium oxide, zinc oxide and sesbania and carrying out kneading, molding, granulating, primary drying, primary roasting, impregnating, secondary drying and secondary roasting in sequence to prepare finished products, carrying out dehydration process before chlorine and oxygen are separated from the mixed gas generated by catalytic oxidation reaction of hydrogen chloride by using adsorption separation method, the mass ratios of alumina gel to silica gel to calcium oxide to zinc oxide to sesbania are (70-82):(7-14):(0.5-2.0):(5-10):(5-10). In the preparing method, water absorption drying agent which is allowed to be used in chlorine-containing gas with small amount of water, and can form the compound absorption bed layer together with the silica gel, the compound bed absorption agent is arranged at the gas outlet end of the compound absorption bed layer to deeply dry and dehydrate gas.

Description

technical field [0001] The invention relates to a preparation method of a modified alumina dehydrating agent, which is mainly used for dehydration before efficient separation of chlorine gas and oxygen gas from the mixed gas generated by catalytic oxidation reaction of hydrogen chloride by adopting an adsorption separation method. Background technique [0002] my country is a big producer and consumer of chlorine gas. There are more than 220 domestic manufacturers producing chlorine gas. Some enterprises use chlorine gas for their own use. There are about 150 enterprises that sell commercial chlorine gas. In 2003, the total output was 2.7053 million tons. In 2012, China's total consumption of chlorine gas exceeded 20 million tons, accounting for about 1 / 3 of the world's total chlorine gas consumption. There are more than 200 kinds of chlorine-containing products produced in my country, including more than 100 kinds of organic chlorine products, more than 50 kinds of inorgani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/30B01D53/28B01D53/02
Inventor 王农跃冯孝庭邵建明丁章云闻国强赵全忠
Owner FININGS CO LTD
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