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Process for producing ethyltoluene

A technology for ethyl toluene and toluene, applied in the field of ethyl toluene production, can solve the problems of inability to precisely adjust the ratio, short regeneration period, etc.

Active Publication Date: 2016-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing technology cannot accurately adjust the ratio of ortho, m and p ethyltoluene in the product, and the regeneration period is short, and a new method for producing ethyltoluene is provided

Method used

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  • Process for producing ethyltoluene
  • Process for producing ethyltoluene
  • Process for producing ethyltoluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Catalyst preparation: 65 parts of SiO 2 / Al 2 O 3 The original HZSM-5 powder with a molar ratio of 90 and 35 parts of binder alumina were kneaded into molding, and the extruded strip product was dried overnight and then calcined in a muffle furnace at 550°C for 6 hours to remove the residual template agent. The obtained samples were impregnated with an aqueous solution of ammonium dihydrogen phosphate with a concentration of 2.0-5.0 wt%, soaked for 2 hours, filtered and dried overnight, and then roasted in a muffle furnace at 550 °C for 6 hours to prepare phosphorus-modified samples. Add the silicone oil solution with a concentration of 10-50wt% to the above-mentioned phosphorus-modified samples, soak for 2 hours, filter and dry overnight, and bake them in a muffle furnace at 550 °C for 6 hours to make silicon-modified or phosphorus-silicon modified samples sample. In the silicone oil solution, the content of methyl silicone oil is 0-40 wt %, the content of amino sil...

Embodiment 2

[0023] Catalyst preparation: 65 parts of SiO 2 / Al 2 O 3 The original HZSM-5 powder with a molar ratio of 90 and 35 parts of binder alumina were kneaded into molding, and the extruded strip product was dried overnight and then calcined in a muffle furnace at 550°C for 6 hours to remove the residual template agent. The obtained sample was impregnated with an aqueous solution of ammonium dihydrogen phosphate with a concentration of 2.0 wt%, soaked for 2 hours, filtered and dried overnight, and then calcined in a muffle furnace at 550 °C for 6 hours to prepare a phosphorus-modified sample. A silicone oil solution containing 20wt% of methyl silicone oil and 10wt% of amino silicone oil was added to the above phosphorus-modified sample, immersed for 2 hours, filtered and dried overnight, and then calcined at 550°C for 6 hours in a muffle furnace to prepare silicon modification. or phosphorus-silicon modified samples. The solvent is n-hexane. The modification times of silicone oi...

Embodiment 3

[0025] The catalyst sample in [Example 1] was loaded into the fixed bed reactor, and the loading amount was 6.5 g. The reaction was carried out using toluene (>99%) and polymer-grade ethylene as raw materials, with an ethylene flow rate of 13.4 g / h and a toluene flow rate of 176.0 g / h. The molar ratio of toluene and ethylene was 4.0 and the total mass space velocity was 29.2 hours -1 , the reaction temperature was 360 °C, and the pressure was 0.5 MPa. The results of the reaction conversion rate and the selectivity of various products are shown in Table 1. Among them, the selectivity of the ortho, meta and para ethyl toluene products has a wide distribution range, which can meet the different requirements of different enterprise users on the selectivity.

[0026] Table 1 - Reaction performance under different modification conditions

[0027]

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Abstract

The invention relates to a method for producing ethyl toluene, which mainly solves the problems in the prior art that the proportions of ortho, meta and para ethyl toluene in the product cannot be accurately adjusted and the regeneration cycle is short. The present invention uses toluene and ethylene as raw materials, the reaction temperature is 300-440 ° C, the reaction pressure is 0.1-2.0 MPa, the molar ratio of toluene and ethylene is 1.0-16.0, and the total feed space velocity is 5.0-80.0 hours ‑1 Under certain conditions, the reaction raw material is contacted with the catalyst to generate ethyl toluene; wherein, the catalyst is phosphorus-silicon modified HZSM‑5 molecular sieve, and in parts by weight, the catalyst includes the following components: a) 75.0~100 parts of HZSM‑5 molecular sieve; b) 0.2~5.0 parts of P 2 o 5 ; c) 2.0~20.0 parts of amorphous SiO 2 ; d) The technical solution of 10-50 parts of binder solves this problem well, and can be used in the industrial production of ethyl toluene.

Description

technical field [0001] The present invention relates to a method for producing ethyl toluene. Background technique [0002] Ethyltoluene is a derivative of toluene with three isomers: ortho-ethyltoluene, meta-ethyltoluene and para-ethyltoluene. Among them, p-ethylbenzene is the most widely used and can be used for further dehydrogenation to prepare para-methylstyrene (para-methylstyrene). p-Methyl styrene is an important monomer for the production of poly-p-methyl styrene (PPMS), unsaturated polyester, and thermoplastic elastomers and other high polymers, and can also be used to replace styrene in the manufacture of ABS resin and other binary , terpolymer, p-methyl styrene is also widely used in nuclear industry and polyacid reinforced fiber and alkyl coatings, etc., and has a wide range of uses. Besides p-ethyltoluene, m-ethyltoluene is another useful reaction product not only for dehydrogenation to m-methylstyrene (a functional monomer), but also widely used as an interm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/02C07C2/66B01J29/40
CPCY02P20/52
Inventor 沈震浩孙洪敏张斌宦明耀薛明伟杨为民
Owner CHINA PETROLEUM & CHEM CORP
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