The method for the epoxidation of cumene hydrogen peroxide and propylene

Abstract

The invention relates to a method for epoxidation of cumene hydroperoxide and propylene, which mainly solves the problem of high reaction temperature rise in the prior art and the need for relatively high propylene and isopropyl hydroperoxide in order to maintain high reaction efficiency. The question of the molar ratio of benzene. The present invention enters the reaction zone by adopting raw materials cumene hydroperoxide and propylene liquid phase, and the total molar ratio of propylene and cumene hydroperoxide is 15-160°C at the epoxidation reaction temperature and 1.0-12.0MPa pressure. Under the condition of 2 to 30, the raw material is contacted with Ti-silicon dioxide catalyst to carry out epoxidation reaction to generate propylene oxide; wherein, the technical scheme that the epoxidation reaction product containing propylene oxide is partially recycled to the entrance of the reaction zone is better This problem has been completely solved, and it can be used in the industrial production of propylene oxide from cumene hydroperoxide and propylene epoxidation.

Description

technical field

[0001] The invention relates to a method for epoxidation of cumene hydroperoxide and propylene. Background technique

[0002] Propylene oxide is an important basic chemical raw material and the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.

[0003] The traditional production process of propylene oxide is the chlorohydrin process, which includes three steps: chloroalcoholization of propylene and hypochlorous acid solution, saponification of chloropropanol and milk of lime, a...

Examples

Embodiment 1

[0030] according to figure 1Shown technical scheme, raw material contains the cumene hydroperoxide mixture of 35% weight concentration, and flow rate is 101166.1 kilogram / hour, raw material propylene 10812.7 kilogram / hour, circulating propylene 92993.1 kilogram / hour, and the circulating ring of 136648.1 kilogram / hour The oxidation reaction products are mixed, and enter a single-bed adiabatic fixed-bed reactor at a reaction temperature of 55 °C and a reaction pressure of 3.1 MPaG, and Ti / SiO 2 Catalyst contact, liquid phase epoxidation reaction produces propylene oxide and dimethyl benzyl alcohol and other by-products. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 10.2, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 16.3, the reactor outlet temperature is 85.8°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4% and the molar selectivity to prop...

Embodiment 2

[0032] Same as [Example 1], only the flow rate of circulating propylene is changed: the circulating propylene flow rate is 61995.4 kg / hour, and others are the same as [Example 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 7.1, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 11.2, the reactor outlet temperature is 89.2°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4%, and the molar selectivity to propylene oxide was 96.0%.

Embodiment 3

[0034] Same as [Example 1], only the reactor form is changed: a two-bed adiabatic fixed-bed reactor, and the others are the same as [Example 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 10.2, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 16.3, the reactor outlet temperature is 85.8°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4% and the molar selectivity to propylene oxide was 96.2%.

technical field

[0001] The invention relates to a method for epoxidation of cumene hydroperoxide and propylene. Background technique

[0002] Propylene oxide is an important basic chemical raw material and the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. It is also the main raw material of the fourth-generation detergent non-ionic surfactant, oil field demulsifier, pesticide emulsifier, etc. Propylene oxide derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.

[0003] The traditional production process of propylene oxide is the chlorohydrin process, which includes three steps: chloroalcoholization of propylene and hypochlorous acid solution, saponification of chloropropanol and milk of lime, a...

Examples

Embodiment 1

[0030] according to figure 1Shown technical scheme, raw material contains the cumene hydroperoxide mixture of 35% weight concentration, and flow rate is 101166.1 kilogram / hour, raw material propylene 10812.7 kilogram / hour, circulating propylene 92993.1 kilogram / hour, and the circulating ring of 136648.1 kilogram / hour The oxidation reaction products are mixed, and enter a single-bed adiabatic fixed-bed reactor at a reaction temperature of 55 °C and a reaction pressure of 3.1 MPaG, and Ti / SiO 2 Catalyst contact, liquid phase epoxidation reaction produces propylene oxide and dimethyl benzyl alcohol and other by-products. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 10.2, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 16.3, the reactor outlet temperature is 85.8°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4% and the molar selectivity to prop...

Embodiment 2

[0032] Same as [Example 1], only the flow rate of circulating propylene is changed: the circulating propylene flow rate is 61995.4 kg / hour, and others are the same as [Example 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 7.1, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 11.2, the reactor outlet temperature is 89.2°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4%, and the molar selectivity to propylene oxide was 96.0%.

Embodiment 3

[0034] Same as [Example 1], only the reactor form is changed: a two-bed adiabatic fixed-bed reactor, and the others are the same as [Example 1]. Cumene hydroperoxide weight space velocity 4.5hr -1 , the molar ratio of total propylene to cumene hydroperoxide is 10.2, the molar ratio of propylene to cumene hydroperoxide at the catalyst bed inlet reaches 16.3, the reactor outlet temperature is 85.8°C, and the cumene hydroperoxide The overall conversion of benzene was 99.4% and the molar selectivity to propylene oxide was 96.2%.

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