59results about How to "Reduce saturation rate" patented technology

The invention provides a process method for making hydrodesulfation and alkene reduction on the bad gasoline, like all-fractional FCC gasoline, etc. Under the conditions of hydrogen gas existence and temperature gradually rising, to contact with three catalysts forms three reaction regions. The first reaction region has lower temperature and uses hydrofining catalyst and mainly eliminates di-alkene in the gasoline; the second reaction region has higher temperature and uses selective hydrodesulfation catalyst and mainly eliminates organic sulfide and some alkenes; the third reaction region has the highest temperature, uses gasoline modifying catalyst and makes the modifying reactions including aromatization, isomerization and benzene alkylation, increasing octane number of gasoline and improving product quality. It has the advantages of simple flow, being easy to operate, fully using reaction heat, prolonging the operating cycle of catalyst, high liquid yield, low hydrogen consumption.

The invention relates to a selective hydrodesulfurization catalyst contains cobalt and molybdenum as active components. The selective hydrodesulfurization catalyst is characterized in that silicon oxide and aluminum oxide are used as carriers of the catalyst; based on the total weight of 100%, the catalyst comprises 2-6wt% of cobalt oxide, 9-15 wt% of molybdenum oxide, 2-8wt% of alkaline earth metal oxide, 2-6wt% of phosphorus oxide, 3-5wt% of alkali metal oxide, 2-6wt% of silicon oxide and 54-80 wt% of aluminum oxide; and the catalyst has the specific surface area of 200-300m<2>/g and the pore volume of 0.5-0.7mL/g. The catalyst has high hydrogenation activity and selectivity, good stability, low research octane number loss and high liquid yield. The catalyst is suitable for selective hydrodesulfrization of low-quality gasoline and is particularly suitable for selective hydrodesulfrization of low-quality FCC (Family Car China) gasoline.

A process for deeply hydrorefining poor-quality gasoline includes such steps as removing biolefine from FCC full-fraction gasoline at lower temp, and modifying (arylisomerizing) and hydrodesulfurizing at higher temp. The hydrodesulfarizing catalyst is the hydrorefining catalyst containing copper oxide and/or zinc oxide.

The invention aims to provide a gasoline selective desulfurization catalyst, and particularly relates to an FCC gasoline selective desulfurization catalyst. The catalyst is prepared by mixing a molecular sieve and a binder, forming the mixture to obtain a carrier and loading active metal ingredient and alkaline metal and/or rare-earth metal to the carrier, wherein the molecular sieve in the carrier is SAPO and/or APO molecular sieve; the binder is aluminum oxide or silicon dioxide; the active ingredient is cobalt-molybdenum composite metal and accounts for 6.5 to 20 weight percent of the catalyst, the alkaline metal and/or the rare-earth metal ingredient account(s) for 0.05 to 8.0 weight percent of the catalyst, and the balance is the carrier; and the relative mass ratio of the molecular sieve to the binder in the carrier is (5-9):(1-5). The catalyst has high hydrodesulfurization activity and selectivity and low olefin saturation ratio when gasoline with low sulfur content is produced by hydrodesulfurization of all fractions of catalytic gasoline, particularly heavy fractions.

The invention relates to a method for improving selectivity of a catalyst. A catalyst selectivity regulation and control process is increased between a desulfurization process and a normal production process, and the catalyst selectivity regulation and control process is that activity catalytic raw materials are in contact with the catalyst for 24-96h in an atmosphere of activity catalytic gas under activity catalytic reaction conditions, wherein the activity catalytic gas comprises hydrogen gas and hydrogen sulfide, and based on the whole activity catalytic gas, the volume fraction of the hydrogen gas is not less than 70%, and the volume fraction of hydrogen sulfide is 0.2%-5%; and the normal production process is that gasoline raw material is in contact with the catalyst in the atmosphere which is rich in the hydrogen gas under normal reaction conditions to be in hydrogenation reaction. By adopting the method provided by the invention, the selectivity of the catalyst can be improved. Compared with the prior art, under the situation that the sulfur content in a gasoline product is the same, the olefin saturation rate is lower and the loss in octane number of a product is smaller.

The invention discloses a method for producing low-sulfur gasoline. The method comprises the following steps of: (1) in the presence of hydrogen and a catalyst A, performing primary desulfurization reaction on raw gasoline, and separating to obtain hydrogenated and desulfurized gasoline distillate oil; and (2) in the presence of inert gas and a catalyst B, performing secondary desulfurization reaction on the hydrogenated and desulfurized gasoline distillate oil, and separating to obtain the low-sulfur gasoline. Compared with the prior art, the method has the advantages that: the gasoline produced by the method has low sulfur content and low olefin saturation rate, and the method has high desulfurization selectivity.

The invention discloses a system and a method for increasing a transceiving separation backscatter communication excitation distance. In the system and the method, the exciter utilizes a repeater architecture to enable an excitation signal transmitted by the exciter and a carrier signal transmitted by the receiver to have high correlation, so that errors such as corresponding phase noise, frequency spectrum and the like are reserved in the excitation signal received by the receiver. The receiver is divided into two paths to receive a carrier signal transmitted by the receiver, an excitation signal transmitted by the exciter and an attached terminal feedback signal; then, the receiver takes a carrier signal transmitted by the receiver as a reference signal in digital processing; and interference of errors of phase noise, frequency spectrum, spatial multipath and the like of excitation signals transmitted by the exciter on feedback signals of the terminal is reduced or eliminated by means of iterative equalization and the like, so that the excitation distance of the transceiving separation backscatter communication system on the terminal is increased, and an error threshold value canbe flexibly adjusted as required.

The invention relates to a method for removing thiol in FCC gasoline through hydrogenation. A fixed bed reactor is adopted; a catalyst contains a silica-alumina supporter and metal active components including nickel, molybdenum, zinc and strontium supported on the supporter and particularly contains the following components in percentage by weight: 2wt%-15wt% of nickel oxide, 2wt%-18wt% of molybdenum oxide, 0.1wt%-5wt% of zinc oxide, 0.1wt%-2.0wt% of strontium oxide and 65wt%-85wt% of the silica-alumina supporter; and the reaction process conditions are as follows: the reaction temperature is110-240 DEG C, the reaction pressure is 1.1MPa-5.5MPa, the volume velocity is 1.2h<-1>-5.5h<-1>, and the hydrogen-oil volume rate is (7-25) to 1. The catalyst has high thiol removal activity and diolefin hydrogenation selectivity and strong adaptability to different raw materials.

The invention discloses a DCO-OFDM modulation-demodulation method and device added with phase modulation, and a method and system including modulation and demodulation. The DCO-OFDM modulation-demodulation method comprises the following steps: at a sending end, producing time domain data x by performing IFFT processing, and obtaining a sequence by processing the time domain data x by adopting a phase modulator; respectively adding cyclic prefix on each of a real number part r and a virtual number part I of the sequence p, and producing time domain analog signals r(t) and i(t) through a digital-to-analog converter DAC and a low-pass filter; adding DC bias on the r(t) and i(t), enabling the amplitude limiting as zero if the obtained signal still has negative value, thereby producing rDCO(t)and iDCO(t); inputting the signals rDCO(t) and iDCO(t) into two optical modulator LEDs, converting electric signals into optical signals, and enabling the optical signals to achieve a receiver throughan optical channel; at a receiving end, performing DC blocking processing on two optical signals after the PD; sampling two analog signals through the low-pass filter and an ADC, and removing the cyclic prefixes to obtain the sequences as shown in description, wherein the formula as shown in description is used as the real part, and the formula as shown in description is used as a virtual part, thereby obtaining the sequence as shown in description; and obtaining the time domain data as shown in description through one phase demodulator, wherein the processing on the time domain data as showin description is similar to the traditional DCO-OFDM scheme. The DCO-OFDM modulation-demodulation method disclosed by the invention is lower in signal-to-noise ratio and higher in BER performance.

The invention discloses a catalytically cracked gasoline desulphurization method. The method comprises 1, according to raw material properties and product targets, selecting an appropriate cut point and carrying out fraction cutting on whole-fraction catalytically cracked stable gasoline from a catalytically cracking device, 2, removing sulfides of heavy fraction gasoline HCN in a fixed bed hydrodesulfurization reactor, and 3, carrying out caustic pre-washing on the light fraction gasoline LCN through a mercaptan removal unit, blending the light fraction gasoline LCN and the heavy fraction subjected to hydrogenation, and carrying out fixed-bed oxidation mercaptan removal to obtain refined catalytically cracked gasoline. The method greatly reduces a gasoline olefin saturation ratio, greatly reduces catalytically cracked gasoline heavy fraction hydrodesulfurization depth and reduces alkene hydrogenation saturation.

The invention discloses a method for producing low-sulfur gasoline. The method comprises the following steps of: (1) cutting a gasoline raw material into a light gasoline fraction and a heavy gasoline fraction, wherein the cutting point of the light gasoline fraction and the heavy gasoline fraction is 50-100DEG C; (2) performing alkali washing on the light gasoline fraction for desulfurization to obtain the desulfurized light gasoline fraction; (3) in the presence of hydrogen and a catalyst A, performing primary desulfurization reaction on the heavy gasoline fraction, and separating to obtain the hydrogenated and desulfurized heavy gasoline fraction; (4) in the presence of inert gas and a catalyst B, preforming secondary desulfurization reaction on the hydrogenated and desulfurized heavy gasoline fraction, and separating to obtain low-sulfur heavy oil fraction; and (5) mixing the light gasoline fraction obtained in the step (2) and the heavy gasoline fraction obtained in the step (4) to obtain a gasoline product. Compared with the prior art, the method has the advantages that: the gasoline produced by the method has low sulfur content and low olefin saturation rate and the method has high desulfurization selectivity.

The invention discloses an alumina support and a preparation method therefor. The alumina support has a pore volume of 0.7mL/g to 1.2mL/g, an average pore size of 100 angstroms to 130 angstroms and aprobable pore size of 60 angstroms to 90 angstroms. The invention further discloses an alumina support employing selective hydrogenation catalyst, a preparation method therefor and a method for lowering content of dialkene in hydrocarbon oil by employing the catalyst. The alumina support disclosed by the invention is large in pore volume and centralized in pore size distribution; and when the hydrogenation catalyst prepared by taking the alumina support as a support serves as a catalyst of a selective hydrogenation reaction or lowering the content of the dialkene in the hydrocarbon oil, the content of the dialkene in the hydrocarbon oil can be effectively lowered, and a relatively low mono-alkene saturation rate is obtained. A product obtained by taking catalytic-cracked gasoline treated by adopting the selective hydrogenation catalyst disclosed by the invention as a feed of an S-Zorb device has the advantages that a dry point is basically unchanged compared with that of a catalytic cracking gasoline raw material, a coking trend of the S-Zorb device is inhibited, and the carbon deposit of the catalyst is obviously reduced.

The invention relates to the field of catalysts, and particularly discloses a gasoline selective hydrodesulfurization catalyst, a preparation method and application thereof, and a gasoline selective hydrodesulfurization method. The catalyst comprises a carrier as well as an active component A, an active component B and a phosphorus element which are loaded on the carrier, the active component A is selected from at least one of VIII group metal elements, and the active component B is selected from at least one of VIB group metal elements; and the molybdenum equilibrium adsorption capacity of the carrier is 6-12% in terms of MoO3, the specific surface area is 100-400 m < 2 >/g, and the pore volume is 0.5-1.5 cm < 3 >/g. When the hydrodesulfurization catalyst provided by the invention is used for a gasoline selective hydrodesulfurization reaction, the sulfur content in gasoline can be remarkably reduced, and the hydrodesulfurization catalyst has a relatively high hydrodesulfurization rate and a relatively low olefin hydrogenation saturation rate.

A method of improving selectivity of a selective hydrodesulfurization catalyst is provided. A catalyst selectivity regulating step is provided additionally between a sulfidation step and a normal production step. The catalyst selectivity regulating step is a step in which a regulating raw material and the selective hydrodesulfurization catalyst are brought into contact for 24-70 h in a regulating gas atmosphere under regulating reaction conditions. By the method, selectivity of the selective hydrodesulfurization catalyst can be improved. Compared with the prior art, in a situation that the sulfur contents of gasoline products are same, the olefin saturation factor of a product prepared by the method is lower and the octane number loss of a product prepared by the method is lower.

The invention relates to a catalyst for gasoline de-mercaptaning. The catalyst contains a silica-alumina carrier, metal active components nickel, molybdenum and iron loaded on the carrier and an additive phosphorus, and is prepared from the components in percentage by weight: 2-15 percent of nickel oxide, 2-18 percent of molybdenum oxide, 0.1-5.5 percent of ferric oxide, 0.01-2.2 percent of additive phosphorus oxide and 65-85 percent of silica-alumina carrier. The catalyst has the characteristics of high de-mercaptaning activity, high diolefin hydrogenation selectivity and low octane number loss.