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A method of separating an olefin from a gas stream
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一种烯烃、气流的技术，应用在分离方法、弥散粒子分离、吸收纯化/分离等方向，能够解决效率低等问题
Active Publication Date: 2007-04-11
BASF SE +1
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Higher paraffins described as viable, but less efficient
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Embodiment approach 1-20
[0159] In the following, preferred methods of the invention obtained from the following explicitly given embodiments 1-20 (including combinations of these embodiments) are enumerated:
[0160] 1. A method for separating propylene from a gas stream comprising propylene and at least one other component, said method comprising the steps of:
[0161] (i) compressing and cooling the gas stream;
[0162] (ii) separating propylene from the gas stream by absorbing propylene in an absorbent;
[0163] (iii) separating propylene from the absorbent by desorption;
[0164] Wherein the compression or cooling or compression and cooling in step (i) is carried out two or three times.
[0165] 2. The method of embodiment 1, wherein the gas stream is an off-gas stream obtained from an epoxidation process comprising reacting propylene with hydrogen peroxide in the presence of methanol solvent and a titanium zeolite catalyst to obtain , methanol and water product stream from which propylene oxi...
Embodiment
[0191] In FIG. 1 is depicted a process according to the invention in which three compression steps are combined with three cooling steps, using tetradecane as absorbent.
[0192] In the first compression unit a1 , an exhaust gas stream 1 with a temperature of 9° C. is introduced at a pressure of 1.1 bar within a mass flow rate of 1,000 kg / h. The exhaust gas stream has the following composition: N 2 (0.22% by weight), O 2 (1.06% by weight), propylene (90.49% by weight), propane (4.54% by weight), methanol (3.51% by weight), water (0.18% by weight).
[0193] From the first compression unit the compressed stream is sent to the first cooling unit a2, the cooled stream is sent to the second compression unit bl and the compressed stream leaving bl is sent to the second cooling unit b2.
[0194] The condensed stream b2 having a temperature of 38° C. was discharged from b2 at a pressure of 6.6 bar and a mass flow rate of 2.66 kg / h. This stream 2 has the following composition: N 2 ...
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Abstract
The present invention relates to a method of separating an olefin from a gas stream, said gas stream comprising the olefin and at least one other component, said method comprising (i)compressing and cooling the gas stream; (ii) separating the olefin from the gas stream by absorbing the olefin in an absor-bent; (iii) separating the olefin from the absorbent by desorption; wherein compressing or cooling or compressing and cooling in (i) is carried out at least twice.
Description
technical field [0001] The present invention relates to a method for separating olefins from a gas stream comprising olefins and at least one other component, said method comprising the steps of: [0002] (i) compressing and cooling the gas stream; [0003] (ii) separating olefins from the gas stream by absorbing the olefins in an absorbent; [0004] (iii) separating olefins from the absorbent by desorption; [0005] Wherein the compression or cooling or compression and cooling in step (i) is carried out at least twice, preferably three times. According to a preferred embodiment of the invention, the olefin is propylene. According to another preferred embodiment, the gas stream is an off-gas stream from an epoxidation process in which an olefin, preferably propylene, is reacted with at least one hydroperoxide, preferably hydrogen peroxide, to obtain olefin oxide, preferably propylene oxide. Therefore, according to yet another preferred embodiment, the separation process de...
Claims
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