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Liquefied petroleum gas dechlorination adsorbent and application method thereof

A technology of liquefied petroleum gas and an application method, which is applied in the field of liquefied petroleum gas dechlorination adsorbents, can solve the problems of frequent regeneration and decreased chloride removal effect, and achieves large adsorption and dechlorination capacity, high adsorption and dechlorination efficiency, and stability. good effect

Inactive Publication Date: 2015-06-10
DONGYING K&T CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this adsorbent is frequent regeneration, and the removal effect of chloride decreases rapidly after contacting with the raw material for more than 16 hours

Method used

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  • Liquefied petroleum gas dechlorination adsorbent and application method thereof
  • Liquefied petroleum gas dechlorination adsorbent and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] 700 grams of average particle size Φ3mm (the average particle size of molecular sieves in other embodiments is the same) NaY molecular sieve (silicon-aluminum atomic molar ratio is 3, specific surface area 550m 2 / g) The carrier was added to 1500 milliliters of aqueous solution containing 583 grams of magnesium nitrate and impregnated for 5 hours, then dried at 150° C. for 4 hours, then roasted in air at 540° C. for 2 hours, and then impregnated with 1000 milliliters of aqueous solution containing 122 grams of zinc nitrate for 4 hours. Hours, then dried at 150°C for 4 hours, and calcined in air at 540°C for 2 hours to obtain Adsorbent A.

[0027] Adsorbent A is composed of 77wt% molecular sieve, 17.3wt% magnesium oxide and 5.7wt% zinc oxide.

example 2

[0029] The average particle size is less than 5μmNaY molecular sieve (dry basis, silicon aluminum atomic molar ratio is 5, specific surface area is 430m 2 / g ) mixed with pseudo-boehmite and kaolin, and then rolled into Φ3mm balls, wherein the content of alumina is 20wt%, the content of kaolin is 30wt%, and the content of molecular sieve is 50wt%.

[0030] Take 500 grams of the above-mentioned Φ3mm balls and add them to 1500 milliliters of aqueous solution containing 583 grams of magnesium nitrate and immerse them for 5 hours, then dry them at 150°C for 4 hours, then roast them in air at 500°C for 2 hours, and then use 3000 milliliters of 610 grams of zinc nitrate The aqueous solution was impregnated three times, the amount of each solution was 1000 ml, impregnated for 4 hours, and after each impregnation, it was dried at 150° C. for 4 hours and roasted in air at 500° C. for 2 hours to obtain adsorbent B.

[0031] The composition of adsorbent B is 27.5wt% of molecu...

example 3

[0033] Add 700 grams of average particle size Φ3mm NaY molecular sieve (same as Example 1) carrier into 1500 milliliters of aqueous solution containing 698 grams of magnesium nitrate and soak for 5 hours, then dry at 150°C for 4 hours, and then roast at 540°C for 2 hours to obtain the adsorbent C, its composition is molecular sieve 83wt%, magnesium oxide 17wt%.

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Abstract

The invention provides a liquefied petroleum gas dechlorination adsorbent and an application method thereof. The technical scheme of the invention is as follows: the adsorbent comprises a molecular sieve and metallic oxides with a chlorine adsorption function, wherein the mol ratio of silicon atom to aluminum atom in the molecular sieve is 1 to 45; the specific surface area of the molecular sieve is 300 to 650 m2 / g; the weight ratio of the molecular sieve to the metallic oxides with the chlorine adsorption function is 45-98: 25-50; the molecular sieve is one or more selected from the group consisting of X type, Y type, A type and ZSM-5 type molecular sieves; and the metallic oxides with the chlorine absorption function comprise two metallic oxides, i.e., magnesium oxide, and one selected from the group consisting of zinc oxide, nickel oxide, copper oxide, platinum oxide, alumina, iron oxide or copper-based metal oxide. The adsorbent provided by the invention has the advantages of large specific surface, uniform pore structure, great dechlorination adsorption capacity, good stability, capability of maintaining high adsorption and dechlorination activities through multiple regeneration, and high adsorption and dechlorination efficiencies.

Description

Technical field: [0001] The invention relates to the technical field of liquefied petroleum gas in refineries, in particular to a liquefied petroleum gas dechlorination adsorbent and an application method thereof. Background technique: [0002] As a product of naphtha cracking and refinery gas fractionation, liquefied petroleum gas will introduce trace (10-200 ppm) organic chloride impurities during the production process, such as methyl chloride, methylene chloride, ethylene dichloride, trichloromethane methane etc. And these chlorine-containing impurities will lead to catalyst poisoning in the further reaction of liquefied petroleum gas (such as polymerization, isomerization, hydration reaction, etc.). Therefore, before the further reaction of the liquefied petroleum gas, the removal of chlorine-containing impurities in the liquefied petroleum gas has attracted great attention, and has become a worldwide problem that needs to be solved urgently. [0003] At present, the ...

Claims

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Application Information

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IPC IPC(8): B01J20/18C10L3/12
Inventor 吴全贵周广林
Owner DONGYING K&T CHEM TECH
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