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Co-extraction system for separation and purification of butadiene and isoprene

A technology of isoprene and crude isoprene, applied in the field of co-extraction system, which can solve the problems of increased land use for public facilities

Active Publication Date: 2017-10-17
SAUDI BASIC IND CORP SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Two or more extraction systems may be required to extract both butadiene and isoprene, resulting in increased capital costs, utilities and land use

Method used

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  • Co-extraction system for separation and purification of butadiene and isoprene
  • Co-extraction system for separation and purification of butadiene and isoprene
  • Co-extraction system for separation and purification of butadiene and isoprene

Examples

Experimental program
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Embodiment 1

[0049] A commercially available process simulation software tool (PRO-II) was used to construct an in-house model describing the process embodiment presented in this disclosure. Process simulation software tools for chemical processes are known to those of ordinary skill in the art. The constructed internal structure model has been successfully used to simulate the process of extracting butadiene in a butadiene plant by using aqueous NMP. The internal model is used to simulate the above and figure 1 and 2 Co-extraction process of butadiene and isoprene in the same plant as shown in .

[0050] The internal model was validated against data from a butadiene extraction plant where C entering the mainwasher column was measured at various locations around the plant. 4 Isoprene spike in hydrocarbon feed stream. The results were compared to those of the model, as shown in Table 1, where the percent isoprene level of the butadiene plant was 100 units of that measured in the feed to...

Embodiment approach 1

[0059] Embodiment 1: A kind of from the C that comprises butadiene 4 Hydrocarbon mixtures and C containing isoprene 5 Co-extraction system for separation and purification of butadiene and isoprene from hydrocarbon mixtures, comprising: (a)C 5 Purification column for receiving C containing isoprene 5 Hydrocarbon mixtures and from the heavy end (heavy end) (C 5 +) Separation from hydrocarbons C 5 the light end of the hydrocarbon mixture; (b) the extraction zone comprising: (i) the mainwasher column for receiving C 5 Light ends of hydrocarbon mixtures, containing butadiene C 4 hydrocarbon mixture, and an extraction solvent, wherein by using the extraction solvent from the C 4 and C 5 The hydrocarbon mixture co-extracts butadiene and isoprene to provide a crude butadiene product, C 4 acetylene, and a crude isoprene product; and (ii) a rectification column for receiving said crude butadiene product, said crude isoprene product, said extraction solvent, and said C 4 Alkynes...

Embodiment approach 2

[0060] Embodiment 2: The system of Embodiment 1, wherein the extraction solvent comprises an aqueous solution of n-methyl 2-pyrrolidone having about 91.7 wt % n-methyl 2-pyrrolidone and about 8.3 wt % water.

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Abstract

Co-extraction techniques are provided for the separation and purification of butadiene and isoprene from a C4 hydrocarbon mixture comprising butadiene and a C5 hydrocarbon mixture comprising isoprene. In an exemplary embodiment, the system includes a dimerization heat exchanger, a C5 purification column, an extraction zone including a main scrubber, a rectification column, and a post scrubber; a distillation zone; a degassing zone; and isoprene workup tower. The system can further include a C5 scrubber, an absorption column, and a distillation column.

Description

technical field [0001] The subject matter of this disclosure relates to 4 and C 5 Co-extraction systems and methods for the separation and purification of butadiene and isoprene from hydrocarbon mixtures. Background technique [0002] used from C 5 extraction of isoprene from hydrocarbon mixtures and / or from C 4 Certain techniques for extracting butadiene from hydrocarbon mixtures are known in the art. For example, U.S. Patent No. 6395953 and U.S. Patent Publication No. 2008 / 0257711 disclose the use of extractive distillation for 4 hydrocarbon fraction or C 5 hydrocarbon fraction) to produce purified conjugated dienes (eg, isoprene or butadiene). U.S. Patent No. 4310388 describes extractive distillation from C with the assistance of a selective solvent 4 - or C 5 - Process for the separation of conjugated dienes from hydrocarbon mixtures. U.S. Patent No. 3692861 discloses from C 5 Process for the separation and purification of isoprene from hydrocarbon fractions. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/08C07C11/167C07C11/18
CPCC07C7/08C07C11/167C07C11/18B01D3/143B01D11/0488B01D11/0492B01D19/0068C07C7/005C07C7/04C07C7/10
Inventor 穆罕默德·萨布里·阿卜杜勒-加尼
Owner SAUDI BASIC IND CORP SA