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

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.

The invention relates to a method for reclaiming ethylene in the process for making ethylene through ethanol dehydration, mainly solving the problems not mentioned in the prior literature including ethylene rectification tower bottoms treatment or greater ethylene loss. The method solves the problems better through adopting the following technical proposal that: ethylene rectification tower bottoms are fed in an adiabatic flash drum; the adiabatic temperature of the flash drum is between 15 DEG C below zero and 80 DEG C and the pressure inside the flash drum is between 1.0 and 4.0 MPaG; finally, after adiabatic flash evaporation, the materials at the top of the flash drum is returned to the middle part of an ethylene rectification tower, and the heavy component at the bottom of the flash drum is discharged. The method can be used in the industrial production of ethylene through adopting ethanol dehydration.

The invention relates to an ethylene separation method, which mainly solves the problems of large loss amount of ethylene in an ethylene rectifying tower and low recovery rate of ethylene in prior art. The separation method of the invention is characterized in that the crude ethylene is compressed and dried to enter in the ethylene rectifying tower, a material flow at the top of the ethylene rectifying tower enters into a light component eliminating tower for separating, a light component is eliminated at the top of the light component eliminating tower to obtain a ethylene product; a material in a tower kettle of the ethylene rectifying tower is flash evaporated through a flash evaporation pot, the material at the top enters in the bottom part of the ethylene rectifying tower, a part of the material at the bottom circularly enters in a central part of the flash evaporation pot, the other part of the material is discharged outside. The technical scheme better solves the problems and can be used in industrial production of ethylene.

The present invention provides a near-freezing point spontaneous modified atmosphere preservation method for Zaojin crisp pears and belongs to the technical field of fruit preservation and storage. The method comprises Zaojin crisp pear fruit harvesting, MAP packaging, pre-cooling, preservative treating, boxing and stacking, near-freezing point storing, etc. and is a complete set of a near-freezing point spontaneous modified atmosphere packaging method for the Zaojin crisp pears. Compared with a conventional cold storage method, the Zaojin crisp pear fruits meet technical requirements in storage and preservation temperature control indexes and at the same time, an O<2> and CO<2> ratio in packaging bags is kept within a suitable range, thereby maximizing inhibition of growth of microorganisms causing spoilage of the Zaojin crisp pears and reducing rot and browning. The method is used to store the Zaojin crisp pear fruits, storage time can be as long as 10 months, a fruit loss rate is less than 5%, and a good fruit rate is higher than 95%.

The invention discloses a fruit and vegetable preservative. The fruit and vegetable preservative is an attapulgite@metal-organic frame composite material (ATP@MOF for short); and the metal-organic frame is hydroxylated Al2(OH)2(C8O6H4). The invention also discloses a preparation method and application of the fruit and vegetable preservative. The preservative disclosed by the invention can remove ethylene gas capable of inducing aging of fruits and vegetables and hydrogen sulfide gas released by mechanical injury wounds from storing and transporting environments, and also has bacteriostatic andinactivating effects.

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.

Provided are Pseudomonas protegens mutant strain Pf5-NiF, Pf5-ΔretS, or Pf5-ΔretS-NiF, and a screening method therefor and an application thereof. By means of Red/ET recombination and direct cloning technologies, the NiF nitrogen fixation gene island in the genome of Pseudomonas stutzeri DSM4166, taken as a whole, is cloned into the genome of Pseudomonas protegens Pf5, so as to heterologously express the same successfully to obtain a genetically engineered strain Pf5-NiF, thereby bringing a biological nitrogen fixation function to Pseudomonas protegens Pf5 which does not own a biological nitrogen fixation function. In addition, gene-directed markerless knockout of retS gene in the genome of Pseudomonas protegens Pf5 is performed to obtain a genetically engineered strain Pf5-ΔretS. Thus, the expression levels of an antibiotic 2,4-diacetylphloroglucinol and red pigment are increased, and a mutant strain of Pseudomonas protegens Pf5 having a stronger bactericidal activity is obtained.

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 relates to a using method of a rare fresh flower fresh-keeping transport device. The using method comprises the following steps of opening an upper cover of a box body, and inserting fresh flowers on a plurality of discs of an upright post of a box body bracket; turning on a fan and a non-equilibrium plasma generator, generating a large number of positive and negative ions through the non-equilibrium plasma generator, sending plasma clusters into the space in the box body by the fan through a plurality of air pipes, so that the sterilization purpose is achieved, and the flowers are kept fresh; turning on an electromagnetic circuit to release an electrostatic field, while water molecules in plants form polar molecules; when an electrostatic field is applied to the plants, thedipole moment of the water molecules is increased until the associated molecular structure of the water is cracked to form single polar molecular structures, and the polar molecules are directionallyarranged in the electric field according to the sequence of positive and negative electrodes. The permeability of cell membranes in plants to the ions is changed, and a resting membrane potential disappears or decreases, or polarity reversion occurs; plant respiration is inhibited through an alternating electromagnetic field, and plant moisture loss is effectively reduced; and the biochemical reaction of the plants is blocked, and the metabolism is inhibited, so that the flowering phase is delayed.

The invention discloses a fruit and vegetable modified atmosphere packaging film. The film consists of the following components in parts by weight: 100 parts of polyethylene resin, 20-24 parts of poly-4-methyl-1-amylene, 30-34 parts of polyvinyl acetate, 4-6 parts of zinc stearate, 3-5 parts of calcium stearate, 5-7 parts of heavy calcium carbonate, 4-6 parts of diatomite powder, 3-5 parts of activated carbon powder, 6-8 parts of isopropyl dimethacrylate, 1.5-2.5 parts of 3,5-di-tert-butyl-4-hydroxy phenylpropionic octadecyl ester and 2-4 parts of liquid paraffin.

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 methane removing unit to obtain methane-hydrogen mixing gasand a methane removing 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 anethane removing tower to obtain ethane 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 provides a catalytic reactor for preparing propylene from methanol, which comprises a catalyst bed layer, and the catalyst bed layer comprises an out-of-vessel deactivated catalyst layerand a fresh catalyst layer, the out-of-vessel deactivated catalyst layer and fresh catalyst layer are provided such that the reaction feedstock first contacts the out-of-vessel deactivated catalyst and then contacts the fresh catalyst. The invention also provides a method for preparing propylene from methanol. The method comprises a step of using the catalytic reactor for preparing propylene frommethanol. Through the catalytic reactor and the method for preparing propylene from methanol, the unit consumption of per ton of propylene and methanol in the whole life cycle of the catalyst can beeffectively reduced.

The invention belongs to the technical field of fresh-keeping, and especially discloses a plum fresh-keeping agent, and a preparation method and applications thereof. The fresh-keeping agent is prepared from radix salviae miltiorrhizae extract, cinnamaldehyde, sodium dichloro isoyanurate, vitamin E9, honey, tetra pentaerythritol ester, microcrystalline cellulose, stearic acid, and purified water via reasonable combination. The plum fresh-keeping agent is prepared via the preparation method, fresh keeping is realized via reasonable immersion. The plum fresh-keeping agent is capable of reducing the content of ethene effectively, inhibiting cell respiration intensity, delaying reducing of acid content, prolonging self life, and realizing fresh keeping.

The invention discloses a fresh-keeping material capable of efficiently removing ethylene, and belongs to the technical field of fresh keeping of fruits and vegetables. A transition metal Cu (I) compound is used as an ethylene fixing agent, and the ethylene fixing agent is loaded on an acidized porous carrier material to form the fresh-keeping material capable of efficiently removing ethylene. The porous carrier material is one of a halloysite nanotube, a carbon nanotube, activated carbon, montmorillonite, attapulgite, diatomite and a molecular sieve. According to the invention, the fixing agent is adsorbed on the porous carrier material, so that the fixing agent adsorbed on the porous carrier material reacts with ethylene through a sigma-pi bond to form a complex, and the porous carrier material with a relatively large specific surface area not only can improve the adsorption capacity to ethylene, but also can load the fixing agent to a great extent; the preparation method of the fresh-keeping material provided by the invention is simple, easy to operate and outstanding in effect, ethylene released by the fruits and vegetables can be effectively removed, and the freshness and shelf life of the fruits and vegetables are prolonged.

The invention discloses a pyrolysis gas separation system with a cooling capacity recovery function and a separation method thereof. The separation system comprises a compressor, a purification system, a cooler, a gas-liquid separation tank, an absorption tower, a desorption tower, a heavy component removal tower, a cold energy recovery system and a C2 hydrogenation reactor, the compressor sections are connected with the purification system and then connected with a compressor rear section; a rear-section outlet of the compressor is connected with the cooler and then connected with the gas-liquid separation tank, a gas-phase outlet of the separation tank is connected with the absorption tower, and a liquid-phase outlet of the separation tank is connected with the de-heavy tower; the top of the absorption tower is connected with a cooling capacity recovery system; the bottom of the absorption tower is connected with the desorption tower; crude ethylene gas is extracted from the top of the desorption tower; the desorption tower kettle is connected with the upper part of the absorption tower; and a heavy component removal tower top pipeline is combined with a desorption tower top pipeline and then is connected with the C2 hydrogenation reactor. The system and the method have the characteristics of low investment, low energy consumption and remarkable benefit.

The invention discloses a cracking gas separation system and method adopting absorption-desorption. The system comprises a compressor, a purification system, a C4 removal tower, an absorption tower, a desorption tower, a depropanization tower, a heavy component removal tower, a C2 hydrogenation reactor and a C4 hydrogenation reactor, wherein the purification system and the C4 removal tower are sequentially connected between the compressor sections, the C4 removal tower top is connected with the rear section of the compressor and then connected with the absorption tower, and the C4 removal tower kettle is connected with the heavy component removal tower; the tower top of the heavy component removal tower is connected with the C4 hydrogenation reactor; an outlet pipeline of the C4 hydrogenation reactor and a tower kettle outlet pipeline of the desorption tower are combined and then connected with the upper part of the absorption tower; the absorption tower kettle is connected with a desorption tower; the top of thedesorption tower is connected with thedepropanization tower, a tower kettle of the desorption tower is combined with an outlet pipeline of the C4 hydrogenation reactor and then is connected with the upper part of the absorption tower; and the top of the depropanization tower is connected with a C2 hydrogenation reactor. The system has the characteristics of low investment, low energy consumption and remarkable benefit.