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.

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.