Catalyst for removing mercaptan in natural gas, and preparation method thereof

A catalyst and natural gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as low sulfur removal rate, and achieve the effects of low reaction temperature, good regeneration performance, and simple preparation process

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the removal rate of sulfur reported in this patent is still relatively low, and the removal rate of methyl mercaptan gas is 97%.

Method used

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  • Catalyst for removing mercaptan in natural gas, and preparation method thereof
  • Catalyst for removing mercaptan in natural gas, and preparation method thereof
  • Catalyst for removing mercaptan in natural gas, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 923.47 grams of specific surface area to 982m 2 / g coconut shell activated carbon, 42.86g specific surface area 411m 2 / g, pore volume 0.96ml / g pseudo-boehmite, 10.10 grams of calcium oxide with a purity of 99%, 30.30 grams of sesame powder with a purity of 99%, the four are evenly mixed to form material A. Measure 122ml water glass solution (SiO 2 250g / L, Na 2 O is 82g / L), dissolve the water glass in water, stir evenly, and configure it as a binder. The binder was added to material A, extruded on an extruder, dried at 120°C for 4 hours, and calcined at 600°C for 4 hours to prepare a catalyst carrier.

[0043] Catalyst active component La 2 O 3 Calculated by 1.5% of the weight of the catalyst, 40.85 grams of lanthanum nitrate hexahydrate (La(NO 3 ) 3 ·6H 2 O) Dissolve in deionized water, stir evenly to form a stable solution, obtain the active component impregnation solution according to the added amount of the carrier, and impregnate the catalyst according to the equ...

Embodiment 2-7

[0045] The activated carbon catalyst was prepared according to the steps and conditions of Example 1, except that the concentration, composition or preparation conditions of the impregnation solution were changed. The changed conditions are listed in Table 1.

[0046] Table 1 Example catalyst composition

[0047] Catalyst / wt% CaONa 2 O

Embodiment 8

[0055] Catalyst evaluation method

[0056] The reactor of the micro reaction device is made of a stainless steel tube with an inner diameter of 20 mm, and the reactor is placed in a thermostat. The catalyst is filled with 10ml, and the upper part is filled with quartz sand of the same size for mixing and preheating. The content of methyl mercaptan in the inlet and outlet gas of the reactor was analyzed by the spectrosulfur chromatograph produced by AC Company.

[0057] Chromatographic operating conditions

[0058] Detector: SCD;

[0059] Chromatographic column: stainless steel column length 30m, inner diameter 0.32mm, liquid film thickness 4μm; liquid film specification PDMS-1

[0060] Column temperature: 250℃

[0061] Detector temperature: 950℃

[0062] Gasification chamber temperature: 275℃

[0063] Carrier gas (N 2 ) Flow rate: 90ml / min;

[0064] Injection volume: 1μL.

[0065] The inlet gas volume composition is CO 2 3%, CH 3 SH 0.01%, H 2 O 3%, the rest is N 2 , The gas volumetric sp...

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Abstract

The invention relates to a catalyst for removing mercaptan from natural gas, and a preparation method of the catalyst, wherein active carbon is used as a catalyst carrier, lanthanum oxide is added asan active component, pseudo-boehmite with large specific surface area and calcium oxide are used as auxiliary agents, and the catalyst is prepared from the following components in percentage by weight: 0.5-1% of CaO, 2-5% of Al2O3, 0.5-1% of Na2O, 1.5-3% of SiO2 and 1-2% of La2O3. The method is simple in preparation process and free of secondary pollution in the preparation process. The catalyst prepared by the method has high mercaptan removal rate and penetration sulfur capacity, is low in reaction temperature, can react at normal temperature, has good regeneration performance, can be recycled multiple times, and can be used for a desulfurization purification device in the natural gas purification industry.

Description

Technical field [0001] The invention belongs to the technical field of natural gas purification, and relates to a catalyst for removing mercaptan in natural gas and a preparation method thereof. The catalyst can be used in desulfurization and purification devices in the natural gas purification industry. Background technique [0002] Natural gas has received more and more attention due to its abundant resources, economic benefits, and environmental protection. The main component of natural gas is alkanes, in addition to H 2 S, CO 2 , H 2 O, organic sulfur and other impurities. Mercaptan is a kind of organic sulfur, its acidity is lower than H 2 S and CO 2 , Slightly soluble in water, not easy to remove. When the content of mercaptan in the air reaches 8×10 -5 mg·L -1 At times, it will produce a strong stench and cause harm to human health. The presence of mercaptans will accelerate the corrosion of equipment. When only elemental sulfur exists in the fuel, 5×10 -6 Corrosion occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C10L3/10B01D53/86B01D53/48
CPCB01J23/10C10L3/103B01D53/8603B01D2255/2063B01D2255/2045B01D2255/2027B01D2255/30B01D2255/702B01D2256/245Y02P20/52
Inventor 刘剑利万辉刘爱华陶卫东刘增让徐翠翠常文之郝国杨
Owner CHINA PETROLEUM & CHEM CORP
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