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Integrated hydro-oxidation process with separation of an olefin oxide product stream

By generating a gas-phase hydrogenation-oxidation effluent in a hydrogenation-oxidation reactor and utilizing a combined method of distillation and refining trains, the problems of dilution, energy consumption and high cost in the separation process of oxyalkenes in the prior art are solved, and oxidation is achieved. Efficient recovery and purification of olefins.

Active Publication Date: 2010-02-10
DOW GLOBAL TECHNOLOGIES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid sorbent methods can be facilitated by using more than two sorbent columns operated in alternating cycles of adsorption and desorption; however, this multi-column approach increases capital investment and operating costs
[0009] Neither liquid absorbent nor solid sorbent approaches are entirely satisfactory for commercialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] refer to figure 1 and Table 1, a catalyst comprising gold deposited on a microporous titanosilicate support (61,800 kg) was prepared as described in US 6,255,499 and then loaded into a fixed bed, continuous flow reactor (137 m 3 volume). ( figure 1 , unit 2) The catalyst is used for the hydrogenation-oxygenation of propylene with oxygen in the presence of hydrogen to form propylene oxide and co-product water. A flow of hydrogen (10% by volume in nitrogen) was started. The reactor was heated from room temperature to 250°C at a rate of 120°C / hour, held at 250°C for 1 hour, and then cooled to 100°C. The reactor was then supplied with nitrogen, heated to 160° C., and held for 1 hour. Thereafter, the temperature was lowered to 140° C., and then a feedstock comprising propylene, oxygen and hydrogen was introduced. ( figure 1 , Input Stream 1) Throughout the run, the process temperature was maintained at 160°C and the process pressure was maintained at 289-302 psia (1992...

Embodiment 2

[0083] refer to figure 2 and Table 2, Example 1 was repeated except that, instead of liquid propylene reflux, n-butane was fed to an external condenser (7) to produce liquid butane reflux for the first distillation column (4) ( 8), and the stripping column (24) is placed between the first distillation column (4) and the refining train (16). In the hydrogenation-oxidation step, the selectivity to propylene oxide was 96.9 mole percent based on the moles of propylene converted. The molar ratio of water to propylene oxide in the hydrogenation-oxidation effluent was 4.3 / 1. The first hydro-oxidation effluent stream (3) is fed to a first distillation column (4) using a butane rectifying agent. The first overhead stream (6) obtained from the first distillation column (4) containing propylene, oxygen, hydrogen, butane and various inert diluents is fed to the condenser (7) and separated into liquid butane Stream (8) and gas stream (9) containing unconverted propylene, oxygen, hydrog...

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PUM

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Abstract

An integrated process providing for a gas phase hydro-oxidation of an olefin, preferably, propylene, with oxygen in the presence of hydrogen and a catalyst under reaction conditions such as to form agaseous hydro-oxidation effluent stream containing an olefin oxide product, preferably, propylene oxide, water, unconverted olefin, oxygen, and hydrogen; and further providing for separation and recovery of the olefin oxide product from the effluent stream. The separation involves feeding the hydro-oxidation effluent stream into a first distillation column employing a liquid reflux rectification agent to obtain a first overhead stream containing unconverted olefin, oxygen, and hydrogen, which is recycled to the hydro-oxidation reactor, and a first bottoms stream containing water and the olefinoxide, from which upon further separation a purified olefin oxide product is recovered.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 60 / 921,947, filed April 5, 2007. Background of the invention [0003] The present invention relates to an integrated process for the hydrogenation-oxidation of olefins with oxygen in the presence of hydrogen to form an effluent stream comprising olefin oxides, water, unconverted olefins, oxygen and hydrogen, and the subsequent separation of the effluent stream to obtain oxyalkylene products therefrom. [0004] Alkylene oxides, such as propylene oxide, are used to alkoxylate alcohols to form polyether polyols, which are widely used in the preparation of polyurethanes and synthetic elastomers. Alkylene oxides are also important intermediates in the preparation of alkylene glycols, such as propylene glycol, and alkanolamines, such as isopropanolamine, which are used as solvents and surfactants. [0005] Over the past few years, several patents ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/10C07D301/32
CPCC07D301/32C07D301/10Y02P20/582Y02P20/52Y02P20/10
Owner DOW GLOBAL TECHNOLOGIES LLC
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