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A kind of process method of preparing nonene by propylene polymerization

A process method, propylene polymerization technology, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of nonene yield, propylene recycling, increase system energy consumption, etc., to reduce the cycle The amount of material, the effect of increasing the conversion rate of propylene and increasing the yield

Active Publication Date: 2020-09-15
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the propylene oligomerization reaction is a complex reaction system with multiple intermediate substances and multiple reactions coexisting, the process adjustment of a single reaction (mainly the adjustment of space velocity and temperature) cannot achieve a further increase in the yield of nonene under existing limiting conditions , especially in NiSO 4 / Al 2 o 3 It is more difficult to increase the yield of nonene under catalytic conditions
The nonene selectivity can be slightly improved by reducing the conversion rate of the single-pass reaction, but it will cause a large amount of propylene to be recycled and increase the energy consumption of the system

Method used

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  • A kind of process method of preparing nonene by propylene polymerization
  • A kind of process method of preparing nonene by propylene polymerization
  • A kind of process method of preparing nonene by propylene polymerization

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Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 As shown, the two temperature-controllable tube-and-tube reactors both adopt NiSO 4 / Al 2 o 3 Catalyst loading, at a space velocity of 3h -1 Under the conditions of 2.0MPa and 50°C, propylene is first reacted in the auxiliary reactor R2. The reaction product is mixed with the return material and enters the main reactor R1, where the second stage reaction is carried out under the conditions of 2.0MPa and 10°C. Propylene / hexene (molar ratio) = 2.64 in the feed to R1. The second-stage reaction product passes through the rectification tower T1 and the rectification tower T2 in turn, and propylene and light components below propylene are separated and returned to R1 for use. The nonene crude product separated from the distillation column T2 has a mass content of 81%, and the rest is mainly heavy components such as C12. The selectivity of the whole process to nonene is 81.7%. All circulating materials / raw materials (molar ratio)=2.6 in the whole process s...

Embodiment 2

[0036] The raw material propylene is mixed with the hexene component separated in the subsequent section, and the space velocity is 3h -1 Under the condition of , the mixed material is reacted in the main reactor R1 under the condition of 2.0MPa and 10°C. Propylene / hexene (molar ratio) = 1.32 in the feed to R1. The reacted material is rectified by the rectification tower T1 to separate light components of C3 and below, which are mainly unreacted propylene. The unreacted propylene reacts in the auxiliary reactor R2 under the conditions of 2.0MPa and 10°C, and the reaction material is fed back to the rectification tower T1 for separation. The heavy components above C3 separated by the rectification tower T1 are sent to the rectification tower T2 for separation, and the hexene component is separated from the top of the T2 tower, and the hexene component is recycled and mixed with the raw material propylene into the first reactor R1. The crude product with nonene as the main com...

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Abstract

The invention belongs to the field of petrochemical industry, and concretely relates to a method for preparing nonene by polymerizing propylene. The method adopts a multistage fixed bed reactor, and nonene is prepared by a liquid phase reaction of a raw material propylene or a liquid containing the propylene component under the action of a catalyst. The multistage reactor comprises a main reactorand auxiliary reactors, which are connected in series or in parallel, the auxiliary reactors are arranged in front of or behind the main reactor, and a material produced in the main reactor undergoesintermediate or final product separation by using one or more rectifying towers. The method fully utilizes the thermodynamic and kinetic factors of the reaction process, considers hexene as an intermediate for preparing nonene from propylene, and additionally arranges the auxiliary reactors to regulate the generation and circulation of the intermediate in order to ensure the proportions of propylene and hexene entering the main reactor, so the conversion rate of propylene is increased, and the yield of nonene is increased; and system optimization and reaction matching are carried out to maximally reduce the amount of circulating materials in the reaction system in order to achieve the energy saving effect.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a process for preparing nonene by propylene polymerization. Background technique [0002] Nonene is an important olefin fine chemical product. It is mainly used in the synthesis of nonylbenzene, nonylphenol, decanol and other products. The existing industrial nonene production methods are mostly obtained by low molecular weight polymerization of propylene under the action of a solid phosphoric acid catalyst. When propylene is oligomerized, in addition to nonene, by-products such as hexene and C12 ene are also produced. NiSO 4 / Al 2 o 3 As a catalyst, NiSO 4 / Al 2 o 3 The catalyst has the advantages of good activity and low reaction temperature, but its disadvantage is that it mainly produces a mixture of nonene and C12 olefins, and its selectivity to nonene is low. Reported NiSO 4 / Al 2 o 3 The reaction temperature on the catalyst is 35° C., the press...

Claims

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Application Information

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IPC IPC(8): C07C2/16C07C11/02
CPCC07C2/16C07C2527/054C07C11/02Y02P20/52
Inventor 艾珍程牧曦韩伟朱林潘相米吴砚会
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND