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Method for preparing polystyrene maleimide membrane for gasoline desulfurization by pervaporation

A technology of maleimide membrane and maleimide, applied in dialysis purification, chemical instruments and methods, semi-permeable membrane separation, etc., can solve the problems of no advantages, large energy, consumption, etc., and achieve cost Inexpensive, simple synthesis steps, and broad application prospects

Inactive Publication Date: 2012-01-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the boiling points of these components are very similar, if the qualified gasoline sulfur content is achieved through traditional distillation or rectification, it is necessary to continuously increase the number of trays and the number of rectification stages, which will not only consume a lot of energy, but also And it will pose a huge challenge to the equipment, so the traditional distillation and rectification methods have no advantages in simulating the desulfurization of gasoline

Method used

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  • Method for preparing polystyrene maleimide membrane for gasoline desulfurization by pervaporation
  • Method for preparing polystyrene maleimide membrane for gasoline desulfurization by pervaporation
  • Method for preparing polystyrene maleimide membrane for gasoline desulfurization by pervaporation

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Embodiment 1

[0038] The preparation method of the present embodiment is realized like this, comprises the following steps:

[0039] Step 1: Preparation of polystyrene maleic anhydride copolymer (SMA)

[0040] Dissolve maleic anhydride in toluene at room temperature; after fully dissolving, add initiator benzoyl peroxide (BPO) and styrene; heat in a water bath at 60°C, react for 2 hours, filter the resulting precipitate, and wash; at 80°C Vacuum dried to obtain polystyrene maleic anhydride copolymer (SMA). The mass percentages of the above raw materials are as follows: maleic anhydride accounts for 5%, toluene accounts for 80%, initiator benzoyl peroxide (BPO) accounts for 2%, and styrene accounts for 13%.

[0041] Step 2: Preparation of polystyrene maleimide (SMI) solid material

[0042]At room temperature, add the polystyrene maleic anhydride copolymer (SMA) prepared in step 1 and n-hexylamine for imidization into the reaction flask, and dissolve it with dimethylformamide; use an inert ...

Embodiment 2

[0048] The preparation technology of the present embodiment is realized in this way, comprises the following steps:

[0049] Step 1: Preparation of polystyrene maleic anhydride copolymer (SMA)

[0050] Dissolve maleic anhydride in toluene at room temperature; after fully dissolving, add initiator azobisisobutyronitrile (AIBN) and styrene; heat in a water bath at 70°C, react for 3 hours, filter the resulting precipitate, and wash; at 90°C Dry under vacuum to obtain polystyrene maleic anhydride copolymer (SMA). The mass percentages of the above substances are: maleic anhydride accounts for 7%, toluene accounts for 75%, initiator accounts for 1.5%, and styrene accounts for 16.5%.

[0051] Step 2: Preparation of polystyrene maleimide (SMI) solid material

[0052] At room temperature, in the reaction flask, add the polystyrene maleic anhydride copolymer (SMA) prepared in step 1, n-heptylamine for imidization, dissolve with dimethylformamide; use inert gas argon protection, Stir ...

Embodiment 3

[0058] The preparation method of the present embodiment is realized like this, comprises the following steps:

[0059] Step 1: Preparation of polystyrene maleic anhydride copolymer (SMA)

[0060] Dissolve maleic anhydride in toluene at room temperature; after fully dissolving, add initiator azobisisobutyrate dimethyl (AIBME) and styrene; heat in a water bath at 80°C, react for 5 hours, filter the resulting precipitate, and wash; Vacuum-dried at 100° C. to obtain polystyrene-maleic anhydride copolymer (SMA). The mass percentages of the above substances are: maleic anhydride accounts for 9%, toluene accounts for 70%, initiator azobisisobutyrate dimethyl (AIBME) accounts for 1%, and styrene accounts for 20%.

[0061] Step 2: Preparation of polystyrene maleimide (SMI) solid material

[0062] At room temperature, add the polystyrene maleic anhydride copolymer (SMA) prepared in step 1 and aniline for imidization to the reaction flask, and dissolve it with dimethylformamide; use in...

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Abstract

The invention discloses a method for preparing a polystyrene maleimide membrane for gasoline desulfurization by pervaporation, and belongs to the technical field of pervaporation membrane separation. The method comprises the following steps of: preparing polystyrene-maleic anhydride copolymer, and reacting the polystyrene-maleic anhydride copolymer with amine for imidization under the action of acatalyst to prepare a polystyrene maleimide solid material; and grinding the prepared polystyrene maleimide solid material into powder, preparing membrane forming liquid, and preparing the polystyrene maleimide membrane by using the membrane forming liquid. The raw material cost is low, synthesis steps are simple, the method is easy to operate, and the polystyrene maleimide membrane has high selective permeability on main sulfides in gasoline, has a high glass transition temperature, can tolerate a high temperature and complex components in the gasoline, and can highly selectively remove organic sulfur from the gasoline in the gasoline desulfurization.

Description

technical field [0001] The invention belongs to the field of pervaporation membrane separation technology and the field of environmental protection technology, in particular to a preparation method of a polystyrene maleimide membrane used for pervaporation gasoline desulfurization. Background technique [0002] As we all know, sulfide in petroleum not only deteriorates the quality of petroleum, but also has a serious corrosion effect on refinery equipment, and sulfide in gasoline can cause serious air pollution. Therefore, the research and development of gasoline deep desulfurization technology has become a major topic in the current oil refining industry. In recent years, countries around the world have increasingly higher requirements for environmental protection, and many countries will formulate new regulations in the near future to reduce the sulfur content to 10ppm or lower. [0003] Commercial gasoline is made up of reformed gasoline, isomerization, and petroleum cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00C08F212/08C08F222/08C08F8/32C10G31/11
Inventor 陈剑李继定杨正金展侠
Owner TSINGHUA UNIV
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