466 results about "Catalytic distillation" patented technology

The invention discloses a method for preparing alcohols from olefin. The method comprises an esterification process and a hydrogenation process. The method comprises the following steps of: performing countercurrent contact on olefin and acetic acid in a catalytic distillation tower on the surface of a solid acid catalyst, and synthesizing corresponding acetic ester by catalytic esterification; and then catalytically converting the acetic ester and hydrogen into corresponding alcohols in a fixed bed reactor by using the synthesized acetic ester as a raw material under a copper-containing hydrogenation catalyst and reaction conditions. The method has the characteristics of simple process flow, mild reaction conditions, low energy consumption, high raw material conversion rate and good production selectivity. Moreover, the method for preparing the corresponding alcohols from the olefin can be also used for preparing acetic ester and ethanol products which are wide in application.

The invention provides a method for preparing isobutylene by comprehensively using mixed C4 and mainly solves the problems of low overall utilization efficiency and low additional value of the mixed C4 byproduct of a refinery or a steam cracking device. An aim is fulfilled by adopting a technical scheme which comprises the following steps of: (1) selectively hydrogenating to remove butadiene in the mixed C4; (2) isomerizing butylenes-1 in the mixed C4 obtained in the first step into butylenes-2 by using catalytic distillation technology, and simultaneously dividing the mixed C4 into two strands of materials, namely the first material comprising isobutylene and iso-butane, and the second material comprising n-butane and butylenes-2; (3) separating the first material through an etherifying device to obtain high-purity isobutylene and high-concentration iso-butane; (4) dehydrogenating the iso-butane to obtain the high-purity isobutylene; and (5) isomerizing the butylenes-2 of the second material into the isobutylene by using isomerizing technology, and simultaneously separating to obtain higher-purity n-butane. The method can be applied to the industrial field of producing the high-purity isobutylene.

The present invention relates to a dual functional catalyst having both the catalytic reaction function and fractionation function and a catalytic distillation equipment for packing the catalyst therein. Said catalyst has a special shape and can be packed at random into the reaction section of said equipment. So, there exist adequate free spaces inside pellet and between pellets, enabling the vapor and liquid streams to pass through the catalyst beds directly and countercurrently, and contact with the dual functional catalyst directly. The reaction between the reactants and fractionation of products can be carried out simultaneously. Thus a high reaction efficiency is achieved. No special inner part is needed in the reaction section to pack the catalysts, so the structure of the equipment is simple and easy to operate, and the investment and cost of operation are low.

The invention discloses a method for producing a clean fuel by adopting chlorine-containing plastic oil, and belongs to the fields of environmental protection and energy technologies. The method is characterized by comprising the steps of injecting the chlorine-containing plastic oil into a catalytic distillation tower filled with a molecular sieve/alumina catalyst for reaction and rectification; performing heat exchange on the chlorine-containing plastic oil after catalytic cracking, feeding the chlorine-containing plastic oil after heat exchange into a low-pressure liquid phase hydrogenation tower, and performing hydrogenation and dechlorination, wherein the used catalyst is a supported metal catalyst; feeding the distillate oil after the liquid phase hydrogenation into a washing tower, circulating the aqueous phase of the lower layer at the tower bottom, compressing the washed distillate oil of the upper layer, feeding the distillate oil into a hydrofining tower, hydrofining with a sulfide catalyst, removing monoene compounds through monoene hydrogenation saturation reaction, removing sulfur, nitrogen and colloids to obtain mixed gasoline and diesel oil without peculiar smell and with high quality, distilling to obtain distillate oil of gasoline and diesel oil, and mixing the heavy oil at the tower bottom and the chlorine-containing plastic oil serving as a raw material for reacting again. The method has the advantages that the process is simple and the activity and selectivity of the catalysts are high, and has good economic benefits and industrial application prospect.

The invention discloses a method for preparing dimethyl succinate. The method comprises two reaction processes of esterification and hydrogenation and the reaction processes are as follows: (1) after pre-esterification reaction, maleic anhydride-methanol solution enters a catalytic distillation tower from the upper rectifying section of the tower, methanol enters the tower from the lower stripping section of the catalytic distillation tower, the reaction section is filled with solid acid catalyst, the two material flows perform countercurrent contact on the surface of the catalyst to perform esterification reaction and synthetize dimethyl maleate; and (2) dimethyl maleate and hydrogen are placed in a fixed bed reactor to perform hydrogenation reaction and generate the dimethyl succinate product in the presence of hydrogenation catalyst under a certain reaction condition. The method of the invention has the advantages of high raw material conversion rate and good product selectivity; and the process flow is simple, the energy consumption is low, no pollution can be caused and the scale production of dimethyl succinate can be realized.

Belonging to the technical field of coal chemical industry and energy sources, the invention discloses a method for preparing clean fuel oil from coal tar. The method is characterized by: distilling coal tar to split into light oil and tower bottom heavy oil, subjecting the tower bottom heavy oil to delayed coking, then mixing it with coal tar and conducting distillation again, subjecting the light oil to high-pressure hydrogenation and catalytic distillation cracking to split it into distillate oil less than 180DEG C, distillate oil greater than 180DEG C and less than 360DEG C, and distillate oil greater than 360DEG C, letting the distillate oil less than 180DEG C directly enter a low-pressure gasoline hydrogenation reactor to undergo hydrofining so as to obtain high-quality gasoline, letting the distillate oil greater than 180DEG C and less than 360DEG C directly enter a low-pressure diesel oil hydrogenation reactor to undergo hydrofining to obtain high-quality diesel oil, mixing the distillate oil greater than 360DEG C with light oil and letting the mixture directly enter a high-pressure hydrogenation reactor to undergo reaction again. The catalytic distillation catalyst and the sulfide catalyst used in the invention select appropriate carriers and active components according to the composition and properties of coal tar. The method provided in the invention has a simple process, lowers equipment investment cost, employs catalysts with high activity and selectivity, has high yields of gasoline and diesel oil, provides a new approach for utilization of coal tar, and has good economic benefits and industrial application prospects.

The invention discloses a method for producing high-quality gasoline/diesel from chlorine-containing plastic oil, belonging to the technical fields of environmental protection and energy. The method is characterized by comprising the following steps: injecting chlorine-containing plastic oil into a high-temperature dechlorination tower filled with active alumina to perform high-temperature dechlorination, spraying a small amount of NaOH water solution on the top of the high-temperature dechlorination tower, and sending the dechlorinated plastic oil into a catalytic distillation tower filled with a molecular sieve/alumina catalyst to perform reaction and rectification; and pressurizing the plastic oil subjected to catalytic distillation into a hydrofining tower, distilling the hydrofined distillate oil under normal pressure, cutting into gasoline and diesel according to the recovered temperature, and mixing the tower bottom heavy oil and the raw material chlorine-containing plastic oil to react. The dechlorination catalyst and sulfide catalyst used by the method can be prepared by proper methods according to the composition and performance of the plastic oil. The method has the advantages of simple technique, high catalyst activity and high selectivity, and has favorable economic benefits and industrial application prospects.

The invention relates to a method for preparing polyoxymethylene dimethyl ether, which mainly solves the problems of low conversion rate of trioxymethylene and low selectivity of DMM 3-8 in current polyoxymethylene dimethyl ether production. According to the invention, under the effective reaction condition, methylal and trioxymethylene are reacted in a catalytic distillation tower, a components separation is performed simultaneously, steam at the top of the tower is condensed and then reflowed, a first part of the materials at the bottom of the tower is vaporized by a reboiler and returned back to the catalytic distillation tower, a second part of the materials is taken as produced liquid, the mass ratio of the first part to the second part is 1-10:1, wherein the trioxymethylene enters from the top of the tower, methylal can enter from any position from a stripping section to the tower top. The technical scheme of catalyst capable of being a heterogeneous phase acidic catalyst can effectively solve the problem, and the catalyst can be used for industrial production of polyoxymethylene dimethyl ether.

The present invention relates to a) a catalytic composite comprising a support structure and a catalytic species that is deposited on the support structure, b) a process for the selective oligomerization of lower alkenes and mixtures of alkenes, which process comprises contacting the lower alkenes with the catalytic composite in a catalytic distillation apparatus and under catalytic distillation conditions, and c) a process for producing high octane products, which process comprises hydrogenating one or more catalytic distillation apparatus and under catalytic distillation conditions.

Processes for the desulfurization of a cracked naphtha by the reaction of hydrogen with the organic sulfur compounds present in the feed are disclosed. In particular, processes disclosed herein may use one or more catalytic distillation steps followed by further hydrodesulfurization of the naphtha in a fixed bed reactor. It has been found that the formation of recombinant mercaptans in the fixed bed reactor effluent may be reduced or eliminated by reducing the concentration of hydrogen sulfide and/or olefins at the exit of the fixed bed reactor. The reduction or elimination in the formation of recombinant mercaptans may be accomplished by recycling a select portion of the fixed bed reactor effluent to the fixed bed reactor, where the select portion has a relatively low or nil concentration of olefins. Processes disclosed herein may thus facilitate the production of hydrodesulfurized cracked naphthas having a total sulfur content of less than 10 ppm, by weight.

The present invention relates to preparation process of tertiary butanol with C4 mixture containing isobutylene as material and through hydration reaction. The present invention features that isobutylene in C4 mixture fraction and water produce hydration to produce tertiary butanol inside catalytic distillation tower in the presence of catalyst and non-ionic surfactant. The said preparation process has high isobutylene converting rate, high tertiary butanol selectivity and low tertiary butanol producing cost.

The invention provides a method for coproducing cyclohexanol and alkanol. The method comprises the following steps: preparing benzene and/or cyclohexane into cyclohexene, carrying out addition-esterification on the cyclohexene in a catalytic distillation tower, obtaining carboxylic acid/ cyclohexyl carboxylate material flow at the bottom of the tower, hydrogenating the material flow to obtain the cyclohexanol and the alkanol. The esterification and hydrogenation reactions in the method have high conversion rate and selectivity, and high atom economy; the process is environment-friendly; the alkanol is coproduced when the cyclohexanol is produced, in particular, when acetic acid is used, the cheap acetic acid is converted into ethanol with high cost and large market capacity in an indirect manner, so as to increase the economical efficiency of the process.

A method for hydroprocessing a hydrocarbon synthesis product feed to form upgraded fuels and lubricating oils. In a preferred embodiment, the method includes the steps of: (a) contacting a Fischer-Tropsch product with a hydroprocessing catalyst to produce a desired distillate; and (b) counter-currently stripping the desired distillate as it is produced. The method may include distilling the desired distillate or distilling the treated Fischer-Tropsch product.

A method using the gasoline hydrogenation to desulfurize is provided, which is carried out in a catalytic distillation column. The catalytic distillation column is divided into a rectification process section, a fractionation section, a stripping reaction section and a stripping section from top from bottom. The preheated raw materials are led into the fractionation section and the hydrogen is led into the bottom of the stripping section; the lighter components fractionated from the fractionation section enter into the section and conduct hydrodesulfurization reaction with the hydrogen under the contact with hydrodesulfurization catalyst A; the discharge on the tower top gains the liquid after cooling and separating; one part of the discharge returns to the rectification process section as the overhead reflux and the other part works as the desulfurized products 1; the heavier components fractionated enter the stripping reaction section and conduct hydrodesulfurization reaction with the hydrogen under the contact with hydrodesulfurization catalyst B and is discharged from the reboiler on the tower bottom after the a stripping section further separates the H2S to work as the desulfurized products 2. The method provided by the invention can obviously improve the rate of the desulfurization of gasoline and have low loss of the octane number of the gasoline.

The invention discloses a method for preparing electronic grade propylene glycol monomethyl ether, which is as follows: propylene oxide and methyl alcohol are taken as raw materials to be converted into propylene glycol monomethyl ether under the condition that triethylamine is used as a catalyst, and the whole reaction process is carried out in a catalytic distillation tower made of stainless steel materials. The metallic ion content of the electronic grade propylene glycol monomethyl ether is greatly reduced from 250-1000PPb to less than 5PPb, and the conversion rate of the propylene oxide is high, i.e. the conversion rate of the propylene oxide is more than 99.5 percent. In addition, the invention can also reduce the generated waste liquor, thereby according with the requirement for environmental protection.