Catalyst for synthesizing methyl mercaptan and preparation method of catalyst

A catalyst and a technology for methyl mercaptan are applied to the catalyst for synthesizing methyl mercaptan and the field of preparation thereof, which can solve the problem of high reaction temperature, and achieve the effects of low activity temperature and good catalyst selectivity.

Active Publication Date: 2014-01-15
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst has good selectivity, and the yield of methyl mercaptan can be over 90%. However, when using this catalyst, the reaction temperature is high, which needs to be between 320°C and 400°C, and the target product has a mass fraction of 5%-10%. Methyl sulfide, need subsequent separation

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  • Catalyst for synthesizing methyl mercaptan and preparation method of catalyst

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Experimental program
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Effect test

Embodiment 1

[0022] A kind of catalyst of synthesizing methyl mercaptan, by carrier gamma-Al 2 o 3 , active component Fe 2 o 3 and additive K 2 O composition, by weight percentage, γ-Al in the catalyst 2 o 3 Accounted for 93%, Fe 2 o 3 Accounting for 5%, K 2 O accounts for 2%.

[0023] The preparation method of described catalyst, concrete steps are as follows:

[0024] (1) Dissolve 0.477g of potassium hydroxide in 10ml of water, then replenish the solution to a volume equivalent to the water absorption capacity of the carrier, and evenly coat the prepared impregnating solution on 18.6g of γ-Al2O3 carrier, at 60°C Bake for 12 hours, and bake for 6 hours at 600°C in a muffle furnace;

[0025] (2) Dissolve 5.05g of ferric nitrate nonahydrate into a volume equivalent to the water absorption capacity of the carrier after step (1), then apply the solution evenly to the carrier after step (1), and finally apply the catalyst Bake at 80°C for 6 hours, and bake at 900°C in a muffle furna...

Embodiment 2

[0027] A kind of catalyst of synthesizing methyl mercaptan, by carrier gamma-Al 2 o 3 , active components ZnO and MoO 3 , Auxiliary K 2 O composition, by weight percentage, γ-Al in the catalyst 2 o 3 75%, ZnO 10%, MoO 3 Accounting for 5%, K 2 O accounts for 10%.

[0028] The preparation method of described catalyst, concrete steps are as follows:

[0029] (1) Dissolve 2.581g of sodium hydroxide in 10ml of water, then replenish the solution to a volume equivalent to the water absorption capacity of the carrier, apply the prepared impregnating solution evenly on 15g of γ-Al2O3 carrier, and place the catalyst at 120°C Bake for 6 hours, and bake for 8 hours at 500°C in a muffle furnace;

[0030] (2) Dissolve 1.350g ammonium heptamolybdate and 7.36g zinc nitrate hexahydrate together to make a volume equivalent to the water absorption capacity of the carrier after step (1), and then apply the solution evenly to the Finally, the catalyst was baked at 100°C for 8 hours, and b...

Embodiment 3

[0032] A kind of catalyst of synthesizing methyl mercaptan, by carrier gamma-Al 2 o 3 , active component Fe 2 o 3 And ZnO and NiO, additive CaO composition, by weight percentage, γ-Al in the catalyst 2 o 3 Accounted for 69%, Fe 2 o 3 10%, ZnO 5%, NiO 10%, CaO 6%.

[0033] The preparation method of described catalyst, concrete steps are as follows:

[0034](1) Dissolve 3.514g of calcium nitrate in 10ml of water, then replenish the solution to a volume equivalent to the water absorption capacity of the carrier, apply the prepared impregnating solution evenly on 15.8g of γ-Al2O3 carrier, and place the catalyst at 100°C Bake for 8 hours, and bake for 8 hours at 400°C in a muffle furnace;

[0035] (2) Dissolve 10.10g of ferric nitrate nonahydrate, 3.68g of zinc nitrate hexahydrate and 7.76g of nickel nitrate hexahydrate to form a volume equivalent to the water absorption capacity of the carrier after step (1), and then the solution is uniformly Coated on the carrier treate...

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Abstract

The invention discloses a catalyst for synthesizing methyl mercaptan and a preparation method of the catalyst. The catalyst comprises a carrier, an active component and an assistant, wherein the carrier is gamma-Al2O3, the active component is one or more of Fe2O3, MoO3, ZnO and NiO, and the assistant is alkali metal oxide or alkaline earth metal oxide. The catalyst is prepared as follows: impregnating a precursor of the assistant on the carrier by using a secondary equivalent-volume impregnation method, loading the precursor containing the active component by using the impregnation method again after roasting for one time, and obtaining a target product namely the catalyst for synthesizing the methyl mercaptan after the secondary roasting. According to the catalyst provided by the invention, methyl alcohol and sulfuretted hydrogen are used as raw materials to synthesize the methyl mercaptan, the selectivity of the catalyst is good, the active temperature of the catalyst is lower than that of the prior art, the reaction temperature is between 230-260 DEG C, the yield of the methyl mercaptan is more than 90%, in addition, no dimethyl sulfide is produced in the target product, so that subsequent separation is not needed.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for synthesizing methyl mercaptan and a preparation method thereof. Background technique [0002] Methyl mercaptan, also known as sulfhydromethane, is an important chemical raw material for the synthesis of medicines, pesticides, methionine and sulfur-containing spices. The production methods of methyl mercaptan are divided into the following types according to the raw material route: the methyl chloride-alkali sulfide method, which has high cost, low yield and pollution. The thiourea-dimethyl sulfate method has expensive raw materials and high production costs. Sodium hydrosulfide-dimethyl sulfate method, the discharge of waste liquid is more. The raw material price of the methanol-hydrogen sulfide method is low, and the hydrogen sulfide in the sour gas of the refinery can be fully utilized, which is suitable for large-scale production. [0003] Curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/78B01J23/28C07C321/04C07C319/08
Inventor 栾立霞毕见东李新牟庆平侯晓锋
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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