41results about How to "Avoid frequent switching operations" patented technology

The invention discloses a method for removing micro-quantity alkene in aromatic hydrocarbon. The method comprises the following steps of: contacting and reacting the aromatic hydrocarbon with a solid acid catalyst under the condition of temperature of 30-350 DEG C, pressure of 0.1-12MPa and feeding quality airspeed of 0.1-15 h<-1>, so that micro-quantity alkene in the aromatic hydrocarbon undergoes adsorbing, overlapping and alkylation reaction so as to remove the micro-quantity alkene in the aromatic hydrocarbon. The method is simple in process procedure, free of oxygen consumption and low in device investment and operation expense; and the catalyst is good in activity stability, the device is long in stable operation time, the aromatic hydrocarbon loss is small, the frequent switching operation between reactor reaction and regeneration is avoided, and the catalyst can be regenerated, so that a great deal of waste catalyst is prevented from being buried, and the environment is less polluted.

The invention discloses a method for removing hydrocarbon out of aromatic hydrocarbon by utilizing an HMCM-41 type mesoporous molecular sieve. The method comprises the following steps of allowing aromatic hydrocarbon to contact and react with solid acid catalyst under conditions that the temperature is between 30 and 350 DEG C, the pressure is between 0.1 and 12MPa and the feeding mass space velocity is between 0.1 and 15 hour<-1> to obtain hydrocarbon removed aromatic hydrocarbon, wherein the hydrocarbon is reformed oil, reformed hydrocarbon or aromatic hydrocarbon generated by a steam cracking device. The method is simple in process flow, does not consume hydrogen, and is low in device investment and operation cost; the catalyst is good in activity stability, the device is stable and long in operation time, less hydrocarbon is lost, and operation of frequent switching between reaction and regeneration of the reactor can be avoided; and the catalyst is reproducible to avoid massive waste catalyst accumulation and bury, and has small influence on the environment.

The invention provides a production method of an HRB500E high-strength and anti-seismic rebar. The production method comprises the step that a billet is manufactured. The billet is prepared from the components in percentage: 0.20%-0.25% of C, 0.40%-0.70% of Si, 1.30%-1.60% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, 0.020%-0.050% of V, 0.0050%-0.0120% of N, and thebalance of Fe and inevitable impurities; the components are basically the same as component formulas used in the production of HRB400 and HRB400E, steel has multiple stages, namely, by adjusting rolling processes, the production of HRB500E and HRB400E can be realized with the same chemical composition formula. Therefore, according to the production method of the HRB500E high-strength and anti-seismic rebar, a unified production technique can be adopted in the preparation of raw materials and blank, the production efficiency is improved favourably, the frequencies of adjusting preparation parameters such as temperature and the proportion of the components are reduced, the stability of products is improved, and the production efficiency is improved favourably.

A process for preparing straight-chain alkylbenzene from C2-C20 straight-chain olefine and benzene features the alkylating reaction between benzene and olefine in the ratio of (2-100):1 in supercritical condition (290-450 deg.C and 5-15 MPa) under the action of solid acid catalyst. Said catalyst is the P-Al molecular sieve with AIPO4-5 crystal structure or the P-Al molecular sieve composition containing substitute element.

The invention discloses a group-sending message processing method and system as well as an electronic device. The group-sending message processing method comprises the steps of generating a message group-sending task based on a group-sending request, wherein the group-sending request carries message content and group-sending target object information; determining a fact that the message group-sending task satisfies a set groups-sending rule; calling a preset session tool and synchronously updating the group-sending target object information to the side of the preset session tool; and sending the message content to the side of one or multiple group-sending target objects indicated by the group-sending target object information through the preset session tool, wherein the one or multiple group-sending target objects belong to a jurisdictional region of one message sender. Through the group-sending message processing method and system as well as the electronic device, the problem of low message content delivery efficiency is solved.

The invention discloses a method for removing a tiny amount of olefins in aromatic hydrocarbon by using a solid acid catalyst. Liquid-phase aromatic hydrocarbons contact and react with the solid acidcatalyst at a temperature of 100-300 DEG C under a pressure of 0.2-10 MPa and a feeding mass space velocity of 0.2-15 h<-1> to carry out alkylation and superposition reactions on the tiny amount of olefins in the aromatic hydrocarbons in order to remove the tiny amount of olefins in the aromatic hydrocarbons, refine the aromatic hydrocarbons and obtain olefin-removed aromatic hydrocarbons; the solid acid catalyst is a meso-porous zirconium phosphate molecular sieve catalyst or a modified mesoporous zirconium phosphate molecular sieve catalyst loaded with a modifying compound; the solid acid catalyst prepared by the method has a high activity, and the olefin removal rate is 98% or above; the catalyst has a good activity stability, and the activity stabilization time exceeds 3000 h; and theselectivity of the reaction for removing olefins from aromatic hydrocarbons is high, and the generation mass fraction of toluene refined by C8 aromatic hydrocarbons is less than 0.1%, and frequent switching operation of reactor reaction and regeneration can be avoided.

The invention discloses a linear alkylbenzene catalytic hydrofining method. The method comprises the steps that under the conditions that the temperature ranges from 60 DEG C to 350 DEG C, pressure ranges from 0.3 MPa to 10.0 MPa, the mass space velocity ranges from 0.2 h<-1> to 10.0 h<-1>, and the hydrogen and oil volume ratio ranges from 300:1 to 8000:1, a hydrogenation raw material and hydrogen are mixed and react with a palladium supported type catalyst in a contact mode so that olefin can be saturated, and then a trace amount of olefin is removed, the bromine index of linear alkylbenzene is reduced, and the product quality is improved; the hydrogenation raw material is linear alkylbenzene obtained by alkylation of benzene with C10-C14 linear olefins mixture in a distillation separation mode, or is alkylation of benzene with C10-C14 linear olefins mixture. The technological process is simple, the catalyst activity is good in stability, the stable operation time of a device is long, reactor reaction and regeneration frequent switching operation can be avoided, less loss of linear alkylbenzene is realized, the catalyst is reproducible, postprocessing of a large number of catalysts can be avoided, and less influence is caused for an environment.

The invention relates to a method for catalytically synthesizing long-chain alkyl aromatic hydrocarbons. The method comprises the following steps: inputting a raw material aromatic hydrocarbon into afixed bed alkylation reactor, and filling the reactor with the raw material aromatic hydrocarbon; inputting a mixture of the raw material aromatic hydrocarbon, raw material C6-C24 long-chain olefins and an additive long-chain alkyl aromatic hydrocarbon solvent or long-chain alkane solvent into the fixed bed reactor, contacting with an SBA-15 type mesoporous molecular sieve alkylation solid acid catalyst, and carrying out an alkylation reaction on the aromatic hydrocarbon and the long-chain olefin to generate a product long-chain alkyl aromatic hydrocarbon; taking one part of an alkylation reactor effluent as a circulating fluid circulating to the reactor, and taking the other part as an effluent fluid for separating excessive raw materials and products in a distillation separation system.The method disclosed by the invention has the characteristics of environmental friendliness, good catalyst activity stability, high conversion rate, high selectivity, high product linearity and low energy consumption.

The invention relates to a solid acid catalytic reaction method for aromatic hydrocarbon long-chain alkylation, which comprises the following steps: feeding raw material aromatic hydrocarbon into a fixed bed alkylation reactor to fill the reactor; feeding a mixture of the raw material aromatic hydrocarbon, the raw material C6-C24 long-chain olefin and an additive long-chain alkyl aromatic hydrocarbon solvent or long-chain alkane solvent into a fixed bed reactor, contacting with an MCM-41 type mesoporous molecular sieve solid acid catalyst, and carrying out an aromatic hydrocarbon long-chain alkylation reaction to generate product long-chain alkyl aromatic hydrocarbon; taking one part of the alkylation reactor effluent as a circulating fluid circulating to the reactor, and taking the otherpart as an effluent fluid for separating excessive raw materials and products in a distillation separation system. The method disclosed by the invention is environment-friendly, good in catalyst activity stability, high in conversion rate, high in selectivity and high in product linearity.

The invention discloses a method for removing trace olefin from aromatic hydrocarbon. The method comprises the step of carrying out contact reaction on aromatic hydrocarbon and a solid acid catalyst under the conditions that the temperature is 30-400 DEG C, the pressure is 0.1-12MPa and the feeding mass space velocity is 0.1-15h<-1> to obtain aromatic hydrocarbon after the olefin is removed. The method is simple in process without consuming hydrogen, low in device investment and operation cost, good in catalyst activity stability, long in device stable operation time and less in aromatic hydrocarbon loss; and reactor reaction and regeneration frequent switching operation can be avoided and a large quantity of waste catalysts can be prevented from being stacked and embedded, and environment influence is little.

The invention provides a group management method and a terminal, wherein the group management method comprises the following steps: creating a wireless local area network; obtaining the signal strength of other terminals accessed to the wireless local area network, and determining the distance between the wireless local area network and each terminal in other terminals according to the signal strength; and sending the distance between the wireless local area network and each terminal to other terminals, such that each terminal determines self state information in a group consisting of all the terminals accessed to the wireless local area network. By means of the technical scheme provided by the invention, on the premise of not increasing the extra cost, the safety condition and the state information of each member in the group can be known in time; simultaneously, the frequent switching operation problem by using an interphone is also avoided; the operation process is simplified; and furthermore, the communication cost is saved.

The invention discloses a method for catalyzing the hydrogenation of acetic acid to produce ethanol by using a transition metal phosphide catalyst. Under the condition that the molar ratio of hydrogen to acetic acid is 1:1 to 20:1, acetic acid and hydrogen are mixed, and contacted and reacted with a supported transition metal phosphide catalyst to hydrogenate acetic acid to produce ethanol; the process of the invention is simple, and the catalyst price Lower, the catalyst performance stability is good, the stable operation time of the device is long, the frequent switching operation of the reactor reaction and regeneration can be avoided, the catalyst can be regenerated, the post-treatment of a large number of spent catalysts can be avoided, and the impact on the environment is small.