50results about How to "Avoid Purification" patented technology

The invention discloses a purification system for flue gas generated by burning wastes and a purification process thereof. The purification system comprises a flue of a refuge incinerator, a dust remover, a device for decomposing and removing dioxins, a flue gas washing tower, a fly ash collecting device, a fly ash washing and dehydrating system, a sewage treatment system, a flue gas heating device and a draught fan; one side of an inlet of the dust remover is connected with the flue, and the other side of the inlet of the dust remover is connected with the device for decomposing and removing dioxins; the fly ash collecting device is connected under the dust remover and the fly ash washing and dehydrating system; the device for decomposing and removing dioxins is connected with the lower part of the flue gas washing tower through a pipeline; an outlet of the flue gas washing tower is connected with the flue gas heating device; meanwhile, a water drain of the flue gas heating device is respectively connected with the fly ash washing and dehydrating system and the sewage treatment system; and purified flue gas is exhausted through the draught fan by using the flue gas heating device. The flue gas can meet the stricter exhaust standard by the purification treatment processes of removing dust, decomposing the dioxins, absorbing and neutralizing acid gases, removing heavy metals, deeply removing dust and the like.

The invention provides pipette tip extraction columns for the purification of a DNA vector from un-clarified cell lysate containing cell debris as well as methods for making and using such columns. The columns typically include a bed of extraction media positioned in the pipette tip column, above a bottom frit and with an optional top frit.

The invention relates to a process for preparing primary amines which comprises the process steps

• • A) provision of a solution of a secondary alcohol in a fluid, nongaseous phase,
  • B) contacting of the phase with free ammonia and/or at least one ammonia-releasing compound and a homogeneous catalyst and optionally
  • C) isolation of the primary amine formed in process step B),

characterized in that the volume ratio of the volume of the liquid phase to the volume of the gas phase in process step B is greater than or equal to 0.25, and/or in that the ammonia is used in process step B) in a molar ratio based on the hydroxyl groups in the secondary alcohol of at least 5:1.

The invention provides a novel method for producing balsampear polypeptide protein extract at a low temperature in the whole course, the balsampear polypeptide protein extract and application thereof, and relates to the technical field of food deep processing. The method comprises the following steps: washing a balsampear raw material, pulping and grinding, putting into a temperature-controllable ultrasonic-assistant extraction tank, adding a neutral buffer solution for extracting, and centrifugally removing slag to obtain centrifugate; filtering the centrifugate through a microfiltration membrane system to obtain microfiltration membrane permeate; filtering the permeate through two roll-to-roll ultrafiltration membrane purification systems having different molecular weights to obtain ultrafiltration membrane trapped fluid; concentrating the trapped fluid with a roll-to-roll high-pressure reverse osmosis permeable membrane to obtain a concentrate having a solid content of more than or equal to 30 percent; and drying the concentrate. The method is operated at normal temperature, and natural activity and more than 20 percent of content of the balsampear polypeptide protein can be effectively guaranteed; the produced balsampear extract has the function of regulating blood glucose, and can be applied to special dietary foods, health foods or medicines for treating or preventing diabetes mellitus.

The present invention provides an isolated and substantially purified recombinant human arginase having sufficiently high enzymatic activity and stability to maintain Adequate Arginine Depletion in a patient. The present invention also provides a pharmaceutical composition comprising the modified invention enzyme and method for treatment of diseases using the pharmaceutical composition.

A heterogeneous liquid-phase process for the hydrogenation of aldehydes of Formula (I) and (III) to the corresponding alcohols of Formula (II) and (IV) which process comprises contacting alcoholic or aqueous-alcoholic solution of aldehydes and hydrogen gas with a catalyst comprising a reduced mixture of CuO and ZnO in presence of a metal of group IIIA of the Periodic Table, such as aluminium, as a promoter at a temperature of between about 110° and 180° C. and a pressure of between about 20 and 500 psig.

The invention discloses a preparation method of tenofovir alafenamide hemifumarate. The preparation method comprises the following steps of: reacting tenofovir with triphenyl phosphite under the condition of alkali catalysis to prepare tenofovir phenol ester; preparing tenofovir alafenamide through acylating chlorination and a reaction with L-alanine isopropyl ester; preparing tenofovir alafenamide hemifumarate by a special salt-forming process with fumaric acid. The tenofovir alafenamide hemifumarate prepared by the process is accurate in control of a salt type ratio, and simple in process operation, and avoids complex process operation and purification means such as chiral resolution, the total purity can reach 99% or more, and indexes of related substances are qualified.

The invention discloses a smelting method of high-nitrogen sulfur-containing free-cutting steel. The smelting method mainly comprises the following steps of converter smelting tapping, LF refining furnace treatment, RH vacuum furnace treatment and continuous casting; an aluminum ingot is added in the tapping process for pre-deoxidation, low-alkalinity slag is made by an LF refining furnace, a small amount of aluminum particles are added in the slag surface, the diffusion deoxidation efficiency is improved, and molten steel is greatly purified; and an RH vacuum furnace adopts nitrogen drive, limit vacuum is kept for a certain time, a first-stage pump is retreated to a fourth-stage pump after vacuum breaking, a nitrogen-containing alloy is added, and circulation is conducted for 5 min, so that the S content and the N content in the steel can be accurately controlled, narrow-range accurate control over molten steel components is guaranteed, meanwhile, the refining period is stabilized, operation is easy, and the method is suitable for mass production. The method is simple, effective, easy to operate, capable of accurately controlling refining time and refining components, improving molten steel quality and guaranteeing the production rhythm and suitable for wide popularization.

A catalyst suited for reducing NOx in an exhaust gas by ammonia in the presence of excess oxygen is arranged in an engine exhaust passage. An aqueous urea solution is fed from a flow addition valve onto a catalyst, part of the urea fed to the catalyst is stored in the catalyst, and the ammonia generated from the urea stored in the catalyst is used to reduce the NOx in the exhaust gas. At the time of engine startup, at the time of cold operation, and at the time of increase of the HC amount, it is determined that the amount of formaldehyde in the exhaust gas flowing into the catalyst exceeds the allowable amount, and, at this time, the feed of urea to the catalyst is prohibited.

The invention provides a molecular sieve adsorption apparatus for high-humidity organic waste gas, which belongs to the technical field of molecular sieves. The molecular sieve adsorption apparatus comprises a waste gas purifying barrel, wherein the top surface of the waste gas purifying barrel is provided with a sealing cover, the left lower end of the waste gas purifying barrel is provided withan air inlet, the right upper end of the waste gas purifying barrel is provided with an air outlet, and a dehydration chamber, a dehumidifying chamber and a purifying chamber are successively arrangedin the waste gas purifying barrel from bottom to top. The molecular sieve adsorption apparatus for the high-humidity organic waste gas has the advantages of good purifying effect and high working efficiency in the aspect of treating the high-humidity organic waste gas.

The invention discloses a preparation method of a compound shown by formula (E), a velpatasvir intermediate shown by formula (K) and an analogue thereof. Materials adopted in the method disclosed by the invention are low-cost and easily obtained; the technological operation is simple; the intermediate and the product need not be subject to column chromatography separation; and the preparation method is suitable for industrialized mass production.

A fuel filter system, especially for Diesel engines includes filter housing (1) having a fuel inlet (27) and a fuel outlet (29) and a dehydrating filter medium (23) between the inlet and the outlet for the fuel to pass through. The filter housing (1) has a collection chamber (35) for the water trapped by the filter medium from which collection chamber the water can be supplied to a water absorbing and evaporating device (49) via a controlled dispenser (45). The components of the evaporating steam are releasable into the environment through the evaporating steam outlet (51). The water absorbing and evaporating device (49) has a valve arrangement (59, 61) by which the evaporating water outlet (51) can be closed depending on an inadmissible amount of non-evaporated water (55) collected in the evaporating device (49).

The invention provides a diflufenican synthesis method, which comprises the following steps of taking 2-hydroxy nicotinic acid as a raw material, carrying out chlorination reaction on the raw material and thionyl chloride to obtain 2-hydroxy nicotinoyl chloride, carrying out amination reaction on the 2-hydroxy nicotinoyl chloride and 2, 4-difluoroaniline to obtain N-(2, 4-difluorophenyl)-2-hydroxy-nicotinamide, and carrying out etherification reaction onN-(2, 4-difluorophenyl)-2-hydroxy-nicotinamide andm-trifluoromethyl benzene halide. Compared with the prior art, the synthesis method has the advantages that the raw material used in the etherification reaction is the m-trifluoromethyl benzene halide, the raw material used in the etherification reaction in the prior art is the m-trifluoromethyl phenol, the m-trifluoromethyl benzene halide is easier to obtain than the m-trifluoromethyl phenol, and the cost is low; according to the method, the production input cost is reduced while high yield and high content of diflufenican are kept; the synthesis method provided by the invention avoids main side reactions in diflufenican synthesis in the prior art.

It is an object to make it possible to burn and remove particulate matter without generating runaway even if the particulate matter is excessively accumulated at the time of regeneration of an exhaust gas purification device. A common rail engine and the exhaust gas purification device placed in an exhaust gas path of the engine are provided. A plurality of regeneration controls for burning and removing the particulate matter accumulated in the exhaust gas purification device can be executed. The plurality of regeneration controls include at least non-operation regeneration control for raising exhaust gas temperature by combining post injection (E) and predetermined high speed rotation speed, and recovery regeneration control which can be executed when the non-operation regeneration control fails. In the non-operation regeneration control and the recovery regeneration control, the engine is driven exclusively for burning and removing the particulate matter. The recovery regeneration control is carried out at exhaust gas temperature lower than that of the non-operation regeneration control while taking time longer than that of the non-operation regeneration control.