327results about How to "Reduce separation energy consumption" patented technology

The invention relates to a separation method for glycol, propylene glycol and butylene glycol and mainly aims to solve the problem of high energy consumption in separation of glycol, propylene glycol and butylene glycol by using azeotropic rectification in the prior art. The invention comprises the following sequential steps that: a raw material containing glycol, propylene glycol and butylene glycol and an extractant enter into an extraction tower (1) respectively from the top and the bottom of the extraction tower, an extractant material flow I containing butylene glycol is obtained at tower top, and glycol material flow II containing propylene glycol is obtained at tower bottom; the material flow I enters into the central part of an extractant recovery tower (2), the recovered extractant is obtained at tower top, and an extractant solution containing butylene glycol is obtained at tower bottom; the material flow I enters into the central part of a glycol treating tower (3), a solution containing propylene glycol and the extractant is obtained at tower top, and the product of glycol is obtained at tower bottom. The method provided in the invention enables the above-mentioned problem to be well overcome and can be used in industrial production for separation of glycol, propylene glycol and butylene glycol.

The invention belongs to the field of chemical reaction engineering and particularly relates to a method for optimizing the operation of an ethylene cracking device. In the method provided by the invention, value maximization is utilized as a scale and the operation optimization scheme of a cracking furnace is formulated aiming at the constitution and market price of different raw materials and the process characteristics of the device by virtue of establishing a yield prediction model, a value prediction model and a value optimization model. After the optimization scheme provided by the invention is adopted, the optimal cracking temperature is lower than the cracking temperature obtained by the optimization scheme which is formulated by the maximum yield of principal products such as ethylene and the like; the operating period of the device is effectively prolonged; the decoking cost is lower; the separation energy consumption is reduced; the potential of the processing capability of the device is further enhanced; and the highest economic benefits are simultaneously obtained.

The invention belongs to the field of chemical industry, and discloses a method for preparing 2-methyl allyl alcohol by esterification and hydrolysis. The method comprises the following steps of: first, performing esterification reaction of 2-methyl allyl chloride and carboxylate; and then, kalifying for hydrolysis reaction to synthesize 2-methyl allyl alcohol. The synthesizing steps are as follows: (1) esterification reaction: under the effect of a phase transfer catalyst, adding carboxylate, water and 2-methyl allyl chloride into a high pressure kettle for esterification reaction; after esterification reaction, cooling, standing and layering the reaction liquor to obtain an organic layer and a water layer, wherein the organic layer is a mixture which takes 2-methyl allyl carboxylate as a main product; (2) hydrolysis reaction: adding alkali liquor to the organic layer obtained in the esterification reaction stage for hydrolysis reaction; cooling, standing and layering the mixed liquor obtained by hydrolysis to obtain an organic layer and a water layer, wherein the organic layer is a target product, namely 2-methyl allyl alcohol. The method is high in material conversion ratio and product selectivity, the product yield is improved, and the separation energy consumption and material consumption are reduced.

The invention relates to a method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon. The method mainly solves the problem of inadequate ability of treating polycyclic aromatic hydrocarbon in the prior art. A technical scheme of the invention adopts the method for disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon, and the method comprises the following steps: with toluene and heavy aromatic hydrocarbon with carbon nine or more containing polycyclic aromatic hydrocarbon as reaction raw materials, carrying out mixing with hydrogen and then carrying out preheating, then allowing the obtained mixture to successively pass through two layers of catalysts, subjecting reactants to heavy aromatic hydrocarbon light fraction reaction on a first layer of the catalysts so as to generate a first reaction product rich in monocyclic aromatic hydrocarbon, and subjecting the first reaction product to disproportionation and transalkylation reaction through a second layer of the catalysts so as to produce xylene; thus, the problem is well solved, and the method can be applied in industrial production of disproportionation and transalkylation of toluene and heavy aromatic hydrocarbon.

The invention relates to a method for synthesizing trioxymethylene by methanol through condensation, oxidation and polycondensation. According to the invention, methanol and dilute formaldehyde with concentration of 5-30% separated from a trioxymethylene apparatus are taken as raw materials to synthesize methylal with concentration of 85-99.9%; methylal and air are subjected to catalyst oxidation to generate formaldehyde through an iron molybdenum method, through refining water and methylal unit tower waste water absorption, a formaldehyde aqueous solution with concentration of 70% is generated; high-concentration formaldehyde is introduced into a trioxymethylene synthetic tower, and the trioxymethylene is synthesized under existence of a strong-acid cation exchange resin catalyst, and trioxymethylene with content of 99.9% can be obtained through steps of rectification and concentration, extraction, rectification, and purifying. The method solves the problems of low conversion rate, selectivity and low yield during a trioxymethylene production process, solves the problems of low catalyst reaction efficiency and corrosivity, and solves the problems of complex technology and high energy consumption. The method provides good raw materials for producing PODE, and realization of industrialization of PODE can solve the problem of excess production capacity of methanol in our country.

The invention discloses a waste processor which comprises a worktable, a waste crusher, a solid-liquid separator, an oil-water separation tank, a heater and an electric cabinet, wherein the waste crusher, the solid-liquid separator, the oil-water separation tank, the heater and the electric cabinet are arranged below the worktable; a secondary solid-liquid separator is arranged in the solid-liquid separator; a spray header and a collection basin are arranged on the worktable; a discharging port is formed in the center of the bottom of the collection basin; a diversion nozzle is arranged on the side surface of the collection basin; a feeding port and a discharging port are formed in the waste crusher; the feeding port of the waste crusher is fixedly connected with the discharging port of the collection basin; a slag inlet is formed in the solid-liquid separator; the slag inlet is connected with the discharging port of the waste crusher through a pipeline; and a diversion port and a ventilation opening are formed between the solid-liquid separator and the oil-water separation tank. Through the manner, the waste processor is capable of effectively crushing the waste, carrying out solid-liquid separation and oil-water separation on the waste, collecting the waste slag and oil-water and realizing the energy-saving idea of waste recycle; and the waste processor is simple in structure and reliable in work.

The invention relates to a method for sequential separation and azeotropic recovery of ethyl benzene/styrene and mainly aims to solve the problems existing in the prior art that the reduction of the polymerization loss of styrene and the reduction of the operating energy consumption cannot be simultaneously achieved in an ethyl benzene/styrene separation industrial device. The method comprises the following steps of: a) making ethyl benzene and styrene containing tower bottoms of a benzene-toluene tower enter an ethyl benzene/styrene separating tower to obtain ethyl benzene containing tower top gas material current I and styrene containing tower bottom material current II; b, putting the material current II in a refined styrene separation tower for separation, putting the material current I in an ethyl benzene/water azeotropic evaporator, heating an ethyl benzene/water mixture from the outside to obtain the ethyl benzene/water azeotropic material current III exchanging heat, partially returning the condensed material current I to the tower top, and partially circulating the condensed material current I to a reaction area; and c), compressing the material current III, and transferring the compressed material current III to the reaction area, wherein an operating pressure of the ethyl benzene/styrene separation tower top is 5 to 20kPaA. The technical scheme better solves the technical problems and can be applied to the industrial production requiring the separation of the ethyl benzene.

The invention relates to a method and a device for selectively removing hydrogen sulfide from gas by utilizing amine droplets, and provides the method for selectively removing hydrogen sulfide from gas by utilizing amine droplets. The method comprises the steps of (1) atomizing N-methyldiethanolamine solution into droplets with particle size of not larger than 50 micrometer; (2) uniformly mixing the droplets with hydrogen sulfide-containing mixed gas, and introducing into a micro-swirler; (3) allowing thorough contact and reaction between N-methyldiethanolamine droplets and hydrogen sulfide in the micro-swirler to transfer hydrogen sulfide into the droplets, and meanwhile separating the hydrogen sulfide-absorbed droplets from gas; and (4) enriching the hydrogen sulfide-absorbed droplets, recycling, regenerating, and circulating to the step (2). The invention also provides the device for selectively removing hydrogen sulfide from gas by utilizing amine droplets.

The invention relates to a method for preparing aldehyde through olefin hydroformylation, aiming at mainly solving the problems in the prior art that the normal/isomeric ratio of the product is relatively low and the stability of a catalyst is poor. According to the method for preparing the aldehyde through adopting the olefin hydroformylation, in an olefin hydroformylation reaction, the catalyst is at least one of a complex catalyst I and a complex catalyst II. With the adoption of the technical scheme, the problems above are solved very well and the method can be used for the olefin hydroformylation reaction.

The invention discloses clostridium beijerinckii XH0906 producing butanol and application thereof. The classification term of the clostridium beijerinckii XH0906 is clostridium beijerinckii which is preserved in CGMCC on 4th, May, 2014 and has the preservation number of CGMCCNo.9124. The strain can growth in a non-strict anaerobic environment and ferment to produce butanol. No sodium hydrosulfite needs to be added to remove oxygen into a fermenting culture medium. In the fermenting process, N2 needs not to be introduced to maintain the anaerobic environment, so that the phenomenon that thalli do not grow as a result of halfway oxygen removal is avoided, and the energy consumption is reduced; moreover, the clostridium beijerinckii XH0906 has the characteristics of high output of butanol, few acetone and ethanol byproducts and the like, the pressure of follow-up butanol recovery is alleviated, and the separating energy consumption is reduced.

The invention provides a method for efficiently preparing 5-hydroxymethyl furfural (HMF) utilizing biomass widely existing in a natural world as a raw material. The method includes the following steps: utilizing a two-phase system composed of low-boiling point organic matter and water, adopting acid salt of sulfuric acid and sulfuric acid metal normal salt as a catalyst in synergy mode to form a catalyst system, adding the biomass raw material capable of being degraded to hexose to a reaction system and preparing the HMF by reaction. The reaction process of the method has high HMF selectivity. The catalyst is low in price, mild in operation condition, simple in process and low in separation energy consumption. The biomass raw material with a wide source is utilized as the reaction raw material, preparation of biomass-based chemical and alternative fuel with the biomass as the raw material can be favorably promoted, and the method has high industrialized prospect.

The invention discloses a method for fully recycling yellow water in a white spirit production process. The method comprises the following steps: firstly, separating yellow water in a raw material tank by virtue of a porous separating membrane system; feeding yellow water clean liquor permeating a porous separating membrane into a pervaporation membrane for further separation; enriching most alcohol, aldehyde and ester matters through the pervaporation membrane on the other side of the membrane in the form of gas state; recovering the matters which are condensed by using a condenser of a pervaporation membrane system to a product storage tank for blending white spirit; increasing fragrant component and the like in original spirit; and further recovering intercepted porous separating membrane permeating liquor and pervaporation membrane permeating liquor. The method disclosed by the invention has the remarkable characteristic that the yellow water recovery efficiency is improved by virtue of two membrane separating and integrating methods including the porous separating membrane and the pervaporation membrane, so that the effective matters of the yellow water are utilized to a maximum extent, thereby thoroughly solving the outlet problem of the yellow water. In addition, the method further has the advantages of being simple in equipment and low in separating energy consumption and has strong practicality.

The invention discloses a method for preparing tert-butyl carboxylate by using a dual-modified SBA mesoporous molecular sieve catalyst. According to the method, carboxylic acid and isobutylene are subjected to addition esterification by using a dual-modified SBA mesoporous molecular sieve as a catalyst to synthesize the tert-butyl carboxylate. The molecular sieve catalyst is a metal-doped sulfonate-grafted dual-modified SBA mesoporous molecular sieve catalyst prepared by a one-step cocondensation process. When the dual-modified SBA mesoporous molecular sieve catalyst is used in the addition esterification reaction process of synthesizing tert-butyl carboxylic acid from carboxylic acid and isobutylene, no polar solvent (such as tert-butyl alcohol, methyl tert-butyl ether or the like) is needed as an isobutylene polymerization inhibitor, and the quantity of the carboxylic acid is not excessive, thereby reducing the energy consumption for separating the reaction product. The catalyst has the advantages of high conversion rate, high selectivity, non-homogeneous phase, no corrosiveness, adjustable acid quantity and acid center and the like, and is recyclable.

The invention discloses a process for producing propylene by using an alcohol-hydrocarbon co-refining technology. The process comprises the steps of (1) introducing a raw gas consisting of methanol and/or dimethyl ether, and C4 or C4/C5 cut fractions and diluent gas into a co-refining reaction zone to have a co-refining reaction in contact with a catalyst, thereby obtaining a co-refining reaction product; and (2) putting the co-refining reaction product obtained in the step (1) and a product of an oil refining device or ethylene unit into a separation zone, performing dehydration and oxide removal, and then separating to obtain a product namely propylene and other hydrocarbon byproducts, wherein the C4 and C5 cut fractions in the hydrocarbon byproducts are returned to the co-refining reaction zone after crude separation. According to the process disclosed by the invention, methanol and/or dimethyl ether and C4 or C4/C5 cut fractions are subjected to co-refining, so that a strong thermal effect existing in separate reactions of the two components is effectively neutralized, and the heat exchange difficulty is reduced; the separation zone is shared by the process and the oil refining device or ethylene unit, so that integrated production is realized, the added values of the C4 or C4/C5 cut fractions of the oil refining device or ethylene unit are improved.

The invention relates to a method for separating glycol and butylene glycol, and mainly aims to solve the problem of high separation energy consumption in separation of glycol and butylene glycol through azeotropic rectification. The method comprises the steps of: putting a glycol solution with butylene glycol content higher than 1% and a strippant into the raw material feeding bed and the strippant feeding bed of a simulated moving bed instrument loaded with an adsorbent, with the extraction solution mixed by the strippant and butylene glycol, and the raffinate mixed by the strippant and glycol, subjecting the extraction solution to separation in a butylene glycol separation tower, recovering the strippant from the tower top, and collecting butylene glycol from the tower kettle, delivering the raffinate into a glycol separation tower, recovering the strippant from the tower top, and collecting glycol from the tower kettle, with the adsorbent selected from at least one of nonfunctional resin or a molecular sieve, and the strippant selected from at least one of polar solvents. The technical method provided in the invention solves the problem well, and can be used in industrial production of glycol and butylene glycol separation.

The invention discloses a process for continuously producing corresponding aldehyde by alkene hydroformylation reaction. The process comprises the following steps: heating a water-soluble alkene hydroformylation catalyst water solution to between 80 and 95 DEG C and then making the water-soluble alkene hydroformylation catalyst water solution enter NO. 1 and NO.2 alkene hydroformylation continuous reactors (I and II) from liquid distributors (2' and 2'); when the catalyst water solution is cyclically stable, introducing mixed gas of alkene and synthesis gas of purified hydrogen and carbon monoxide to the NO.1 reactor, and carrying out hydroformylation reaction on the alkene on an interface of a cyclical catalyst liquid membrane; discharging unreacted mixed gas at the end of a separation section of the bottom of the NO.1 reactor and a gas-phase byproduct from the NO.1 reactor; automatically separating an aldehyde product from the catalyst water solution, discharging the aldehyde product and the catalyst water solution from liquid aldehyde outlet (4') of the NO.1 reactor, and making the aldehyde product and the catalyst water solution enter a coarse aldehyde tank (12); and supplementing the mixed gas of the alkene and the synthesis gas of the hydrogen and the carbon monoxide by the unreacted mixed gas which is discharged from a reaction residual gas outlet (3') of the NO.1 reactor and the gas-phase byproduct, and introducing the mixed gas into the NO.2 reactor (II) to further react.

The invention provides an extraction agent for extracting, rectifying and separating methanol and dimethyl carbonate azeotrope, application of the extraction agent, and a treatment method. The extraction agent is a mixed extraction agent containing ionic liquid. A system for extracting, rectifying and separating methanol and dimethyl carbonate azeotrope comprises a reaction rectifying tower, an extraction rectifying tower and an extraction agent regeneration tower which are sequentially connected, wherein the extraction rectifying tower uses the extraction agent to perform extraction and rectification. The extraction agent has the advantages that the extraction agent can effectively change the relative volatility of methanol and dimethyl carbonate azeotrope, increase the separation effectof the methanol and dimethyl carbonate azeotrope, the purity of obtained dimethyl carbonate can reach 99.8wt% or above, and the circulating loss rate of the extraction agent can be lowered to 0.01% orbelow; the extraction agent can guarantee the conversion rate of ethylene carbonate and lower the concentration of circulating methanol, and accordingly thermal load is reduced, and separation energyconsumption is reduced.

The invention relates to the technical field of production of m-phenylenediamine and particularly discloses a method for purifying m-phenylenediamine. The method for purifying m-phenylenediamine is characterized by comprising the following steps: continuously feeding pre-molten m-phenylenediamine ash into a rectifying tower to be rectified, and extracting partial liquid through an extraction pipe; directly injecting the extracted m-phenylenediamine into a crystallizer, heating until the m-phenylenediamine is totally molten, cooling, crystallizing and cooling, draining the mother solution by a drain valve of the crystallizer, feeding to the next-stage crystallizer to be continuously molten and crystallized, wherein the operation process is the same as that in the previous step; and collecting the feed liquid obtained by multistage melting and crystallizing, cooling and slicing in an inert protection atmosphere, thereby obtaining the finished purified m-phenylenediamine product. According to the m-phenylenediamine purified by the method disclosed by the invention, the content of the impurity, namely diaminotoluene, in the m-phenylenediamine is less than 50ppm, the requirements on synthesis of aramid fibers 1313 and other high-purity applications can be met, the principle is scientific, the utilization rate of the materials is improved, the separation energy consumption and equipment investment are reduced, and the method is green and economical.

The invention relates to a rotational-flow purifying device for a gaseous product in a fluidized-bed residual oil hydrogenation reactor. The device comprises the fluidized-bed residual oil hydrogenation reactor and a thermal high-pressure gas/hydrogen heat exchanger, wherein a thermal high-pressure flash tank is arranged between the reactor and the heat exchanger, and comprises a thermal high-pressure flash tank shell and an inlet distribution ring arranged in the shell; the inlet distribution ring has a spiral structure and defines a spiral channel together with the thermal high-pressure flash tank shell; a gaseous product inlet is formed in the thermal high-pressure flash tank shell; a tangential inlet guide pipe is mounted on the gaseous product inlet; the thermal high-pressure flash tank also comprises a micro-rotational-flow separator set arranged at the top in the thermal high-pressure flash tank shell. According to the device, the gaseous product in the fluidized-bed residual oil hydrogenation reactor is subjected to stepped rotational-flow separation, so that the entrainment quantity of liquid and catalysts in the gaseous product during a cold high-pressure separation process is reduced, the problem of blockage of the high-pressure heat exchanger is avoided, the energy consumption of a fluidized-bed hydrogenation device is greatly reduced, and the running cycle of the device is prolonged.