- 5-ethylidene-2-norborene ENB method for the production of (by machine translation)
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The invention relates to a production method for ENB (5-ethylene-2-norbornylene) and mainly aims to solve the problems in the prior art that the purity of a product is low and the energy consumption is high. The adopted production method for the ENB comprises the following steps: (1) raw materials and a solvent are sent to a first reaction vessel through a static mixer; (2) the reaction product in the first reaction vessel enters into a light component removing tower, tower top light components return to the first reaction vessel and tower kettle heavy components enter into a heavy component removing tower; (3) the kettle components of the heavy component removing tower enter into a DCPD tower, and tower top distilled liquid is purified to obtain a DCPD product; (4) the heavy component removing tower kettle components enter into a VCH tower, the VCH is obtained at the tower top; tower kettle components enter into a VNB tower, THI is obtained in a VNB tower kettle and the VNB is obtained at the tower top; (5) VNB enters into an isomerization reaction vessel to obtain ENB. The problems are better solved by the technical scheme and the production method can be applied in the ENB production.
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Paragraph 0020-0026
(2017/05/26)
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- Production method of ENB (ethylidene norbornene)
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The invention discloses a production method of ENB (ethylidene norbornene). According to the method, a tank reactor is adopted, DCPD (dicyclopentadiene) is pyrolyzed into CPD (cyclopentadiene), CPD and 1,2-BD (butadiene) have Diels-Alder reaction and are converted into ENB, a reaction product is subjected to distillation separation, and an ENB product with the content higher than 99.5% is obtained. The reaction adopts acetone as a solvent, the mole ratio of BD to DCPD is (0.2-1.5):1, the weight ratio of the solvent acetone to DCPD is (0.5-2.0):1, the adding amount of TBC (4-tert-butylcatechol) as a polymerization inhibitor accounts for 0.003% of the mass of DCPD, the reaction temperature is 170-190 DEG C, the system pressure is 7-11 MPa, and the reaction time is 2-8 h. Compared with the prior art, the production method has a simple reaction process, the reaction convention rate is increased obviously, and the ENB selectivity is improved obviously.
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Paragraph 0023; 0024; 0027
(2017/02/24)
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