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A method for preparing methyl styrene and co-producing mesitylene from C9 aromatic hydrocarbon mixture dehydrogenation and alkyl aromatic hydrocarbon dehydrogenation catalyst

A technology for methyl styrene and dehydrogenation catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of increased operating energy consumption, The problem of high energy consumption of fractional distillation achieves the effect of cost saving, energy consumption reduction and simple process

Active Publication Date: 2021-03-26
曹炳铖
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the actual operation process, because the boiling point difference of each component in the C9 aromatics is very small, if the mesitylene content is higher in the enriched fraction to be obtained, the light component content lower than the mesitylene boiling point is lower, resulting in The energy consumption of pre-fractionation is high, resulting in a substantial increase in the energy consumption of extractive distillation to extract mesitylene

Method used

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  • A method for preparing methyl styrene and co-producing mesitylene from C9 aromatic hydrocarbon mixture dehydrogenation and alkyl aromatic hydrocarbon dehydrogenation catalyst
  • A method for preparing methyl styrene and co-producing mesitylene from C9 aromatic hydrocarbon mixture dehydrogenation and alkyl aromatic hydrocarbon dehydrogenation catalyst
  • A method for preparing methyl styrene and co-producing mesitylene from C9 aromatic hydrocarbon mixture dehydrogenation and alkyl aromatic hydrocarbon dehydrogenation catalyst

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preparation example Construction

[0048] The present invention also provides a specific embodiment of the preparation method of the alkylaromatic dehydrogenation catalyst. The specific steps may include: weighing Fe, K (excluding K in the binder and pore-forming agent), Ce, Compounds of Ca, Zr, La and Sr, binders and pore-forming agents are mixed and pulverized in a pulverizer for 10 to 20 minutes, and an appropriate amount of deionized water is added and kneaded for 30 to 120 minutes by a kneader, and the prepared The viscous paste is extruded and diced to make Φ1×(1-3) mm particles, dried at 120°C for 6-12 hours, and then roasted at 400-900°C for 4-8 hours in an air atmosphere to obtain alkyl Aromatic dehydrogenation catalyst.

[0049] In the above specific embodiment, the pore-forming agent can be selected from polystyrene microspheres and hydroxyethyl cellulose, and its addition can be 5 to 15% by mass of the dry basis of the catalyst; ferric oxide can be Iron oxide red (Fe 2 O 3 ) and iron oxide yellow...

Embodiment 1

[0068] Weigh 40.7 grams of iron oxide red Fe 2 O 3 , 20.3 grams of iron oxide yellow Fe 2 O 3 ·H 2 O, 16.1 grams of potassium carbonate, 7 grams of CeO 2 , 5 grams of CaO, 7.8 grams of zirconium hydroxide, 2.5 grams of La 2 O 3 , 1.8 grams of strontium nitrate, 8.5 grams of potassium silicate, 5 grams of polystyrene microspheres and 4 grams of hydroxyethyl cellulose were mixed and pulverized in a pulverizer for 20 minutes, and stirred with a kneader after adding 30 grams of deionized water Knead for 70 minutes, extrude the viscous paste and cut into pellets to make Φ1×(1~3)mm particles, dry at 120°C for 10 hours, and then bake at 800°C for 4 hours in an air atmosphere to obtain Finished catalyst S1. The composition of catalyst S1 is listed in Table 2. Put 30ml of catalyst into the reactor, under reaction conditions: temperature is 630°C, liquid hourly volume space velocity is 1.0h -1 , the water-to-hydrocarbon ratio was 1.6, and the pressure was under normal pressure ...

Embodiment 2

[0070] Prepare catalyst by the method for embodiment 1, difference is to take by weighing 40.7 gram iron oxide red Fe 2 O 3 , 20.3 grams of iron oxide yellow Fe 2 O 3 ·H 2 O, 16.1 grams of potassium carbonate, 7 grams of CeO 2 , 5 grams of CaO, 7.8 grams of zirconium hydroxide, 2.5 grams of La 2 O 3, 1.8 grams of strontium nitrate, 8.5 grams of sodium silicate, 5 grams of polystyrene microspheres and 4 grams of hydroxyethyl cellulose were mixed and pulverized in a pulverizer for 20 minutes, and stirred with a kneader after adding 30 grams of deionized water Knead for 70 minutes, extrude the viscous paste and cut into pellets to make Φ1×(1~3)mm particles, dry at 120°C for 10 hours, and then bake at 800°C for 4 hours in an air atmosphere to obtain Finished catalyst S2. The composition of catalyst S2 is listed in Table 2. Put 30ml of catalyst into the reactor, under reaction conditions: temperature is 630°C, liquid hourly volume space velocity is 1.0h -1 , the water-to-h...

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Abstract

The invention discloses a method for preparing vinyltoluene and coproducing mesitylene through dehydrogenation of a C9 aromatic hydrocarbon mixture and an alkyl aromatic hydrocarbon dehydrogenation catalyst. The method comprises the steps of introducing a C9 aromatic hydrocarbon mixture (1) containing propylbenzene, methyl ethylbenzene and mesitylene into a dehydrogenation reactor (R1) to be in contact with alkyl aromatic hydrocarbon dehydrogenation catalyst, and carrying out dehydrogenation, so as to obtain a mixed product (2) containing vinyltoluene and mesitylene. According to the method provided by the invention, vinyltoluene and mesitylene can be coproduced; and the catalyst provided by the invention is good in catalytic activity and stability and high in selectivity.

Description

technical field [0001] The invention relates to a method for preparing methyl styrene and co-producing mesitylene from a mixture of carbon and nine aromatic hydrocarbons and a dehydrogenation catalyst for alkyl aromatic hydrocarbons. Background technique [0002] There are three isomers of methyl styrene, all of which are similar in properties to styrene, and are often used to replace styrene with a wide range of uses. It can be used as a polymerized monomer, or it can be copolymerized with a variety of different second monomers to synthesize adhesives, resins, inks, dry cleaning agents and coatings. There are three kinds of p-methylstyrene, m-p-methylstyrene mixture and o-methylstyrene that are used more in industry. p-methylstyrene is the monomer for producing polymethylstyrene (PPMS). PPMS has a lower density than polystyrene (PS), shrinks in volume during polymerization, has a high heat resistance temperature, and is easy to form and process. Moreover, PPMS is elastic a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C5/333C07C15/02C07C7/04C07C7/08B01J23/83
CPCB01J23/002B01J23/83B01J2523/00C07C5/3332C07C7/005C07C7/04C07C15/46C07C15/02B01J2523/842B01J2523/13B01J2523/3712B01J2523/23B01J2523/48B01J2523/3706B01J2523/24Y02P20/52
Inventor 曹炳铖
Owner 曹炳铖
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