40results about How to "Lower ethylene content" patented technology

The invention discloses a pseudomonas protegens mutant strain Pf5-NiF, Pf5-delatretS or Pf5-delatretS-NiF, a screening method and application thereof. By a Red / ET recombining and direct cloning technology, an NiF nitrogen fix gene island in a genome of pseudomonas stutzeri DSM4166 is integrally cloned into a genome of the pseudomonas protegens Pf5 to obtain a genetic engineering strain Pf5-NiF through smooth heterogeneous expression, so that the pseudomonas protegens Pf5 without a biological nitrogen fixing function itself generates the biological nitrogen fixing function; in addition, a retS gene in the genome of the pseudomonas protegens Pf5 is knocked out through directional unmarked gene knockout to obtain a genetic engineering strain Pf5-delatretS, so that the expression amount of antibiotic 2, 4-diacetyl phloroglucinol and haematochrome is increased, and thus the pseudomonas protegens Pf5 mutant strain with stronger bactericidal activity is obtained.

A catalytic conversion process of petroleum hydrocarbons in double reactor, and apparatus thereof are disclosed. The catalytic conversion process takes place in both the main reactor and the secondary reactor where reaction feedstock is lighter than the former. The first low temperature catalyst is introduced into the pre-lift section of the main reactor, and the said catalyst is conveyed to the oil / catalyst contact reaction section by the pre-lift gas and contacts with the feedstock from the feeding nozzle for the catalytic conversion reaction. The reaction mixture goes up and contacts with the second low temperature catalyst fed to the main reactor above the feeding nozzle, and the catalytic conversion reaction continues in the post-reaction section so as to complete the catalytic conversion reaction of the feedstock from the main reactor. Through flexible control over the reaction condition of the contact reaction section and post-reaction section of the reactor,thermal cracking reaction is effectively reduced, the reacting efficiency of the post-reaction section is improved. Accordingly, the reaction byproduct is effectively reduced and the product distribution is flexibly modified.

The invention relates to a method for preparing an aromatic hydrocarbon from a mixed light hydrocarbon. In the prior art, the energy consumption for recycling ethylene in the mixed light hydrocarbon raw material is high. A purpose of the present invention is mainly to solve the problem in the prior art. The technical scheme of the present invention comprises that 1) a light hydrocarbon raw material is subjected to cooling separation to obtain hydrogen-rich gas and a hydrogen-depleted liquid; 2) the hydrogen-rich gas is separated by a dehydrogenation unit to obtain hydrogen and a dehydrogenation stream; 3) the hydrogen-depleted liquid is subjected to rectification separation to obtain a heavy removing stream and a first aromatic hydrocarbon stream; 4) the methane removing stream and the heavy removing stream are converged, and the converged stream is fed into a light hydrocarbon aromatization reactor, and is converted into an aromatization product; 5) the aromatization product is subjected to cooing separation to obtain a gas phase product and a second aromatic hydrocarbon stream; 6) the gas phase product is compressed, and the compressed product is fed into an ethane removing towerto obtain fuel gas and a circulation stream; and 7) the circulation stream returns the light hydrocarbon aromatization reactor. With the technical scheme, the problem in the prior art is well solved.The method of the present invention can be used in the industrial production of light hydrocarbon aromatization.

The invention discloses a technology for separating low carbon olefin gases, for solving the problems that hydrogen, methane, ethane and propane and other products with high purity can not be acquired and dimethyl ether and oxygen and carbon monoxide in impurities are not removed efficiently, etc. in the prior art. The technology is characterized in that a step of removing carbon monoxide and oxygen is added, methanol-to-olefin gas streams processed by removing carbon monoxide and oxygen enter into a deethanizing column, deethanizing column overhead streams successively pass through an ethene hydrogenation reactor, six separation pots, a low pressure demethanizing column and an ethene rectification column, etc. to separate to obtain ethene and ethane products, and deethanizing column bottom streams successively pass through a propyne hydrogenation reactor, a methane stripper and a propylene rectification column, etc. to separate to obtain propylene and propane products. According to the invention, polymer grade ethene and propylene products can be obtained, and hydrogen, methane, ethane and propane products, etc. with high purity can be obtained.

This invention relates to methods of forming polyalkene-substituted carboxylic acid compositions. When the reaction is carried out in the presence of a controlled amount of a metal compound, the formation of polyolefin-substituted carboxylic acids by the halogen-assisted reaction of polyolefins with at least one ethylenically monounsaturated monocarboxylic or dicarboxylic acid, anhydride or ester is reduced. Residual chlorine content of acid acylating agents.

Described herein is a process in which acetic acid is produced by ethane oxidation. One byproduct of the ethane oxidation is ethylene. High ethylene content in the recycle gas stream will lead to poor efficiencies and higher losses to the COx byproduct in the acetic acid reactor. In fact, ethylene in the recycle feed competes with the ethane for the limited amount of oxygen feed, resulting in higher inefficiencies to carbon oxides than straight ethane oxidation. Ethylene is removed in this process by a further oxidation reaction at a temperature low enough such that ethane is not reactive, but the ethylene is converted to acetic acid. Either the ethane oxidation reactor effluent or a portion or all of the recycle stream to the ethane oxidation reactor, or any combination of the same, can be processed in this manner to reduce the ethylene content of those streams.

A solid-state antistaling agent for storing winter jujube is prepared from calcium silicate, iron powder, potassium permaganate, activated carbon and dimethyl fumarate.

The invention relates to a method for increasing the ethylene yield in a process of preparing ethylene through ethanol dehydration, and mainly solves a problem, which is not involved in documents in the past, of increasing the ethylene yield in the process of preparing ethylene through ethanol dehydration, especially a problem of ethylene rectification tower bottoms treatment or great ethylene loss. According to the technical scheme of the method, the tower bottom of an ethylene rectification tower is fed to the top of a heavy-component stripping distillation tower, the tower top vapour phase of the heavy-component stripping distillation tower is fed back to the middle and lower part of the ethylene rectification tower, and the heavy components are discharged from the bottom of the heavy-component stripping distillation tower. By the technical scheme, the problem is solved well and the method can be used in industrial production of the ethylene through ethanol dehydration.

The invention relates to a method for separating low carbon olefin mixed gas by rectifying and absorbing. The method utilizes a hydrocarbon or oxygen-containing organic compound absorbent to separate methane from C2; a rectifying method is used for separating C2-C4 so that polymeric layer ethylene and propylene are obtained. By utilizing the method, the ethylene is separated from the methane by using the absorbent and without setting any deep freeze refrigeration plant (such as a refrigerator, an expander and the like); the lowest operation temperature of the process is more than minus 40 DEG C and the material cost of the device is reduced. By utilizing the absorbent, the ethylene is absorbed in an absorption tower so that the separation between the ethylene and the methane is realized; as boiling points of the absorbent and the ethylene are greatly different, the absorbent is easily separated from the ethylene, the solvent loss is less, and the absorbent does not pass through other towers and does not cause incomplete separation formed by generating azeotropy with C5 and the like.