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100results about How to "Reduce polymerization" patented technology

Method for widening catalytic reforming feedstock

ActiveCN102041092AExpand sourceSlow down olefin polymerizationTreatment with hydrotreatment processesChemistryNaphtha
The invention relates to method for widening catalytic reforming feedstock. The comprises the following steps: mixing FCC (fluid catalytic cracking) stabilized gasoline and straight-run naphtha in a ratio of (50:50) to (70:30), filtering the obtained mixture by a feedstock filter so as to remove impurities in the mixture, and then removing the water carried in the mixed naphtha by a coalescer; mixing the mixed naphtha with hydrogen, and heating the obtained mixture to a reaction temperature by a heating furnace, then feeding the obtained mixture into a hydrogenation reactor to contact with a hydrogenation catalyst so as to be subject to olefin saturation, desulphurization and denitrification reactions; and condensating and cooling the obtained hydrogenation effluent, then separating the obtained product so as to obtain hydrogen-rich gas and hydrogenated gasoline, recycling the hydrogen-rich gas, and feeding the hydrogenated gasoline into an evaporation tower to be subject to strippingfractionation, thereby obtaining a refined naphtha meeting the reforming feeding requirements. By utilizing the method provided by the invention, the mixed naphtha containing more than 50 percent of the FCC stabilized gasoline can be subject to hydroprocessing so as to obtain the refined naphtha, wherein the content of the impurities in the refined naphtha satisfies the reforming feeding requirements, thereby solving the shortage problem of the reforming feedstock, and widening the source of the reforming feedstock.
Owner:PETROCHINA CO LTD +1

Method for preparing high-purity dicyclopentadiene

The invention discloses a method for preparing high-purity dicyclopentadiene (DCPD). The method comprises the steps of adding a diluting agent into crude dicyclopentadiene serving as a raw material during depolymerization, mixing dicyclopentadiene with the diluting agent in a ratio of 0.5-5, and then putting the mixture into a depolymerization rectifying tower, wherein at a normal pressure, the depolymerization temperature is 160-200 DEG C, the reflux ratio is 0.5-5, and the depolymerization time is 1-3 hours; obtaining high-purity cyclopentadiene (CPD) from the top of the tower, putting the cyclopentadiene into a tubular reactor to finally obtain dicyclopentadiene of which the purity is more than 99%, wherein the reaction temperature is 40-120 DEG C, the reaction pressure is 0.1-1.5MPa, and the residence time is 4-10 hours. The method disclosed by the invention has obvious beneficial effects, can reduce polymerization reaction of the crude dicyclopentadiene during depolymerization, and can improve the yield of the dicyclopentadiene; meanwhile, the diluting agent can ensure that impurities including isopropenyl norbornene and the like can be depolymerized, and the purity of dicyclopentadiene is improved, so that the method is particularly suitable for preparing high-purity dicyclopentadiene from the raw material of crude dicyclopentadiene which is obtained through pyrolysis C5 thermal dimerization separation.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for producing hexamethylenediamine key intermediate 6-aminocapronitrile by continuous gas-phase two-step method

The invention provides a method for producing a hexamethylenediamine key intermediate 6-aminocapronitrile by a continuous gas-phase two-step method. The method comprises the following steps: S1, mixing caprolactam and water in a gas phase state to carry out continuous hydrolysis or mixing caprolactam and ammonia water in a gas phase state to carry out continuous hydrolysis ammoniation reaction toobtain a first product system containing 6-aminocaproic acid, 6-aminocaproic acid ammonium salt and/or 6-aminocaproamide; and S2, carrying out continuous gas-phase catalytic ammoniation and dehydration reaction on the first product system and ammonia gas to obtain a second product system containing 6-aminocapronitrile. According to the patent of the invention, the problem that water generated by reaction in a one-step process promotes polymerization reaction of the raw material caprolactam is reduced from the source, and the selectivity of aminocapronitrile is improved; and the problems of catalyst deactivation and pressure drop rise caused by polymerization and coking of caprolactam in the reactor are effectively reduced, the stability of the device is improved, and the service life of the catalyst is prolonged.
Owner:JIANGSU YANGNONG CHEM GROUP +2

Method for separating and cracking cyclopentadienyl from carbon 5 fraction

The invention discloses a method for separating and cracking cyclopentadiene in C5 distillate. The method belongs to the technical field of C5 separation. In order to solve the problems that the industry requires the dimerization reaction of cyclopentadiene as much as possible; and the industry also requires the higher quality of a dicyclopentadiene product and little loss of isoprene, the invention provides the method which comprises the following steps: setting a suspension type dimerization reactor on the body of a C5 mixture rectification tower, leading liquid phase material stream from a tower plate of the rectification tower and pumping the liquid phase material stream into the dimerization reactor, making the cyclopentadiene in the material stream to have a liquid phase dimerization reaction in the suspension type dimerization reactor, and then returning the material stream back to the rectification tower from the suspension type dimerization reactor. The method can be applied to the prior industrial C5 production device and the process of one-section extraction separation and cracking of C5 distillate. The method can reduce polyreaction besides the self-dimerization of cyclopentadiene, improve the quality of the dicyclopentadiene product, reduce the loss rate of isoprene, and reduce the cyclopentadiene content in the materials as much as possible.
Owner:CHINA PETROLEUM & CHEM CORP +1

Oil slurry scale inhibitor

The invention discloses an oil slurry scale inhibitor. The oil slurry scale inhibitor is prepared from the following components in percentage by mass: 25 to 40 percent of a detergent dispersant, 6 to12 percent of a phenol-amine type antioxidant, 5 to 10 percent of a corrosion inhibitor, 0.5 to 3 percent of a detergent, 0.4 to 0.5 percent of a metal passivating agent and the balance of a solvent,wherein the detergent dispersant is polyisobutylene succinimide and / or polybutadiene mercaptohexanediol phosphate. The oil slurry scale inhibitor disclosed by the invention has a low freezing point (less than or equal to -15 DEG C), small viscosity (the kinematic viscosity is less than or equal to 50 mm<2> / s at 20 DEG C), a strong anti-oxidization capability and good thermal stability; propertiesand utilization performance of the oil slurry scale inhibitor are not influenced at relatively high temperature of 350 to 400 DEG C and the oil slurry scale inhibitor is suitable for scale inhibitionand descaling in an oil slurry system in a catalytic cracking device; the adding amount of the oil slurry scale inhibitor in oil slurry is 30 to 100 ppm; the oil slurry scale inhibitor can be used foreffectively inhibiting equipment including the oil slurry system, a pipeline, a heat exchanger and the like from being coked; the scale inhibition rate can reach 90 percent and safe and stable operation of a device is ensured.
Owner:JIANGSU KECHUANG PETROCHEM
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