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Process and system for producing an oxirane

A technology for oxirane and peroxy compounds, which is applied in the field of production of oxirane compounds, and can solve problems such as high cost, reduced selectivity of oxirane compounds, energy consumption, etc.

Inactive Publication Date: 2014-08-20
BLUE CUBE IP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) High levels of methanol must be separated from the oxirane product and recycled, which results in high energy consumption and associated high costs for the process and can produce high levels of by-products
[0010] (2) High reaction temperature can cause hydrolysis and / or solvolysis of oxirane compounds and form unwanted by-products, thereby reducing the selectivity of desired oxirane compounds

Method used

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  • Process and system for producing an oxirane
  • Process and system for producing an oxirane
  • Process and system for producing an oxirane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Example 1 (run 1)

[0110] The test covers the optimum working conditions that yield the highest selectivity in at least 8 hours of operation, and even up to 24 hours of operation. Reactor at temperature 10°C and space velocity 1.8hr -1 Under operation, the Epi selectivity obtained is 98.2%.

Embodiment 2

[0111] Example 2 (run 2)

[0112] This experiment was performed to illustrate the effect of temperature at similar LHSV values. The run was at a reactor temperature of 40 °C and a space velocity of 1.9 hr -1 Under operation, the Epi selectivity obtained is 83.2%. While the other two control parameters (such as productivity and reduction in peroxide concentration in the effluent) improved, the selectivity dropped dramatically.

Embodiment 3 and 4

[0113] Examples 3 and 4 (runs 3 and 4)

[0114] These examples are comparative examples to Example 2 as a means of demonstrating the effect of varying the LHSV when operating at the same reactor temperature of 40°C. Examples 2-4 cover the entire range of LHSVs claimed. It shows that as LHSV increases (from 0.48 to 14.7hr -1 ), the Epi selectivity is improved (98% of the mismatch cold temperature), and the H in the effluent 2 o 2 Increased concentration (e.g. decreased peroxide conversion).

[0115] pressure drop

[0116] Table 2 summarizes the pressure drop achieved across the catalyst bed in the reactor during the process run at the indicated reaction mixture composition and recycle stream flow rate.

[0117] Table 2 – Pressure drop

[0118]

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Abstract

Embodiments of the present disclosure provide processes and systems for the epoxidation of an olefin using a fixed bed reactor. The fixed bed reactor is maintained at a temperature from 0 to 40 degrees Celsius. The processes and systems regulate a superficial liquid velocity of a non-homogeneous reaction mixture and recycled portion of effluent of the fixed bed reactor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit under 35 U.S.C. §119(e) of US Provisional Patent Application No. 61 / 555,931, filed November 4, 2011, which is hereby incorporated by reference in its entirety. technical field [0003] Embodiments of the present disclosure relate to methods and systems for producing oxiranes. Background technique [0004] Oxiranes are valuable chemicals and find use in a wide variety of end-use applications. For example, epichlorohydrin is an oxirane compound and is a valuable chemical commodity widely used in the manufacture of epoxy resins on an industrial scale. Currently, epichlorohydrin is manufactured using the "chlorohydrins" method. The process begins with the chlorohydrination of allyl chloride by reaction with an aqueous dispersion of chlorine in water. This process forms an isomeric mixture of 1,2- and 1,3-dichlorohydrins, which are dehydrochlorinated in caustic solution to yield epich...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12
CPCC07D301/12Y02P20/582
Inventor C·E·梅扎P·J·卡尔伯格H·L·克兰普顿
Owner BLUE CUBE IP
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