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Production system and method for methylallyl alcohol

A technology for the production of methallyl alcohol, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of hydroxyl compounds, etc., can solve problems such as reducing reaction selectivity, reduce polymerization, avoid catalysis, and improve operation The effect of flexibility

Active Publication Date: 2017-11-21
齐翔华利新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more significant disadvantage is that during the hydrogenation process, the double bond of methacrolein is easily saturated at the same time to generate isobutanol, which greatly reduces the selectivity of the reaction.

Method used

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  • Production system and method for methylallyl alcohol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for producing methallyl alcohol using the system of the above specific embodiment 1, such as figure 1 As shown, the specific steps are as follows:

[0037] (1) Feed the fresh isopropanol dehydrated to the moisture content below 50ppm and the recycled isopropanol dehydrated to below 50ppm moisture content by the molecular sieve adsorption tower into the isopropanol inlet 13 of the reactive distillation tower 1; Aluminum propoxide is sent to the catalyst inlet 14 of the reactive distillation tower 1, and the methacrolein is sent to the methacrolein inlet 15 of the reactive distillation tower 1, wherein the molar ratio of methacrolein to isopropanol is controlled to be 5:1; the reactive distillation tower 1 is provided with a rectification section 10, a reaction section 11, and a stripping section 12 from top to bottom. The reactive distillation tower 1 is located between the rectification section 10 and the reaction section 11 The isopropanol inlet 13 and the cat...

Embodiment 2

[0046] Same as the above embodiment 1, the difference lies in:

[0047] In step (1), the feeding molar ratio of methacrolein and isopropanol is controlled to be 0.1:1;

[0048] In step (2), the top pressure of the reactive distillation tower 1 is controlled to 5 kpa, and the temperature of the reaction section 11 of the reactive distillation tower 1 is controlled to 60°C;

[0049] In step (3), the pressure of the falling film evaporator 7 is controlled to 101kPa;

[0050] In step (4), the top pressure of the acetone product tower 2 is controlled to 60kPa, and the temperature is controlled to 40°C;

[0051] In step (5), the top pressure of the isopropanol recovery tower 3 is controlled to 100kPa, and the temperature is controlled to 76°C;

[0052] In step (6), the top pressure of the methallyl alcohol light removal tower 4 is controlled to 101kPa, and the temperature is controlled to 110°C;

[0053] In step (7), the top pressure of the methallyl alcohol product tower 5 is controlled to 101...

Embodiment 3

[0056] Same as the above embodiment 1, the difference lies in:

[0057] In step (1), the feeding molar ratio of methacrolein and isopropanol is controlled to 10:1;

[0058] In step (2), the top pressure of the reactive distillation tower 1 is controlled to 500kpa, and the temperature of the reaction section 11 of the reactive distillation tower 1 is controlled to 80°C;

[0059] In step (3), the pressure of the falling film evaporator 7 is controlled to 115kPa;

[0060] In step (4), the top pressure of the acetone product tower 2 is controlled to 70kPa, and the temperature is controlled to 50°C;

[0061] In step (5), the top pressure of the isopropanol recovery tower 3 is controlled to 800kPa, and the temperature is controlled to 140°C;

[0062] In step (6), the top pressure of the methallyl alcohol light removal tower 4 is controlled to 800 kPa, and the temperature is controlled to 160°C;

[0063] In step (7), the top pressure of the methallyl alcohol product tower 5 is controlled to 700k...

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Abstract

The invention discloses a production system and method for methylallyl alcohol. The production system is characterized by comprising a reactive distillation tower, an acetone product tower, an isopropanol recovery tower, a methylallyl alcohol light-component removing tower, a methylallyl alcohol product tower, a molecular sieve dehydration tower, a falling-film evaporator and a film evaporator. The refining method comprises the following steps: feeding each raw material into the reactive distillation tower, conveying a gas phase generated after a reaction into an acetone separation tower, and conveying a liquid phase to the falling-film evaporator; conveying a gas phase obtained after separation by the acetone separation tower into the acetone product tower, and returning a material at the bottom of the acetone separation tower to the reactive distillation tower; collecting acetone at the top of the acetone product tower, and conveying a material at the bottom of the acetone product tower to the isopropanol recovery tower; returning circulating acetone obtained at the top of the isopropanol recovery tower to the reactive distillation tower for participation in the reaction, and conveying a material obtained at the bottom of the isopropanol recovery tower to the methylallyl alcohol light-component removing tower; returning light components obtained at the top of the methylallyl alcohol light-component removing tower to the isopropanol recovery tower, and conveying a material obtained at the bottom of the methylallyl alcohol light-component removing tower to the methylallyl alcohol product tower; and collecting a methylallyl alcohol product from the top of the methylallyl alcohol product tower. The production system and method provided by the invention have the advantage of high conversion efficiency and high product purity.

Description

Technical field [0001] The invention relates to a method for producing methallyl alcohol, in particular to a system and method for producing methallyl alcohol which is safe and energy-saving. Background technique [0002] Methallyl alcohol is a very important organic intermediate that can undergo self-polymerization and copolymerization reactions. Using methallyl alcohol as the starting material, methacrylic acid and esters can be prepared. In addition, methallyl alcohol can also generate allyl esters with other organic acids. Therefore, methallyl alcohol is widely used in polymer monomers, surfactants, synthetic resin additives, polycarboxylic acid superplasticizers, medicines, pesticides, flavors and fragrances, building materials, textiles, automotive exterior coatings, food additives, etc. . [0003] The traditional production method of methallyl alcohol is the chlorinated hydrolysis of isobutylene. Isobutylene undergoes a two-step reaction. The first step is the reaction b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C29/76C07C29/80C07C33/03C07C45/00C07C45/81C07C45/82C07C49/08
CPCC07C29/14C07C29/76C07C29/80C07C45/002C07C45/81C07C45/82C07C33/03C07C49/08Y02P20/10
Inventor 陶小钰谷新春汪青海李联豹李新赵化龙马文华王宇光李全龚超庄志海
Owner 齐翔华利新材料有限公司
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