32results about How to "Reduce safety and environmental risks" patented technology

The invention discloses a probenazole production process, comprising the steps of: carrying out a condensation reaction on lactic acid and o-phenylenediamine in hydrochloric acid water solution; regulating pH to obtain 2-alpha-hydroxyethyl benzimidazole; putting into a container using acetone and sulfuric acid as solvents for oxidization with potassium permanganate; extracting, desolventizing anddrying to obtain 2- acetyl benzimidazole; putting into a container using glacial acetic acid as a solvent to be brominated with bromne; drying a filtering cake to make 2- Dibromo-acetyl benzimidazolehydrobromide; finally cyclize with formamide and phosphorus pentasulfide in a container using ethyl acetate as a solvent; purifying; and regulating the pH to obtain probenazole, the content of which is larger than or equal to 99%. The production process reduces the cost and risks of safety environmental protection, reduces environmental pollution, enhances production efficiency, enables the wholereaction process to execute at normal temperature and pressure, and has mild reaction condition and stable reaction yield of each step. The total yield counted by the o-phenylenediamine is above 75%.

The invention discloses a pre-joint-coating method for a welded junction of a steel pipe. The pre-joint-coating method comprises the steps that a stainless steel short pipe is inserted into the steelpipe from the end of the welded junction, so that a first end and a second end of the stainless steel short pipe are located in the steel pipe; from the first end, in the direction away from the shortpipe, a welding gun rotates and performs bead weld to the inner wall of the steel pipe to a first end point to form a first welding layer; from the first end point to the second end, the first welding layer and the stainless steel short pipe are solidly dissolved by the welding gun in order to form a point potential gradual transition from low carbon alloy to stainless steel, and the contact surface of the first welding layer and the short pipe is formed into a slope-like transition; and from the second end to the end of the welded junction, the bead weld of the inner wall of the steel pipe is performed by the welding gun to form a second welding layer. The pre-joint-coating method for the welded junction of the steel pipe solves the technical problem in the prior art that the anticorrosion joint coating for the interior of the steel pipe is difficult, and achieves the technical effect of reducing the risk of safety and environmental protection caused by corrosion leakage of the pipeline.

The invention provides an anti-backflow device for incoming liquid in a low-potential well group, which includes an anti-backflow pipeline and a straight-through pipeline. The anti-backflow pipeline and the straight-through pipeline are connected in parallel, and one end of the parallel connection communicates with the incoming liquid pipeline of the low-potential well group. One end is connected with the liquid inlet pipeline of the main shut-in well group; the anti-backflow pipeline is provided with solenoid valve 1, pressure gauge 1, check valve, pressure gauge 3, needle valve, solenoid valve 2 in sequence according to the direction of entering the station. The pipeline is provided with pressure gauge 2 and solenoid valve 3 in sequence according to the direction of entering the station. The invention can prevent a single well from backflowing to the wellhead of a single well due to pressure relief from other well groups in the station, reduce safety and environmental protection risks, prevent oil and gas well gathering and transportation pipelines from accumulating and freezing, and reduce difficulties in production and management of oil and gas wells.

The invention relates to a method for harmless treatment and recovery of magnesium fluoride polluted acid in a zinc smelting process, comprising: 1) harmless reuse of polluted acid; Seeds, modifiers, demagnesiasing agents, lime, etc., heat up and stir, filter to obtain demagnesium solution and magnesium fluoride concentrate, add tannic acid to the demagnesium solution to precipitate germanium, recover germanium, and filter to obtain germanium tannin Slag and germanium precipitation liquid, tannin and germanium slag are burned to obtain germanium concentrate, and the post germanium precipitation liquid is sent to leaching air for oxygen purification to remove iron and fluorine; 3) air oxidation to remove iron and fluorine after germanium precipitation; 4) iron removal After fluorine, the liquid copper slag is dechlorinated. The invention achieves the open circuit of magnesium oxide, reduces the harm of magnesium oxide in the hydrometallurgical zinc solution system, and recovers magnesium, fluorine and acid harmlessly; by adding active agent, the problem of easy formation of colloid in high zinc-containing solution is solved, and fluorine is changed. The characteristics of magnesium fluoride slag in high zinc ion solution make magnesium fluoride slag form a spongy structure, which is easy for liquid-solid separation.

The present invention discloses a method for preparing anhydrous sodium chromate. The method comprises the steps of mixing a sodium chromate alkali solution with a carbonating solution in proportion of (1:1) to (8:1), and then, adjusting the pH to 6.5-8.5 to obtain a pretreatment solution of sodium chromate; placing the pretreatment solution of sodium chromate in an evaporation crystallizer for vacuum evaporation at the temperature of 80 DEG C to 120 DEG C under the pressure of 0.01 MPa to 0.09 MPa; and when the solid-to-liquid ratio reaches 10%-50% through vacuum evaporation, performing solid-liquid separation at the temperature of 70 DEG C or above to obtain anhydrous sodium chromate and a filtrate. Based on the technology characteristics of sodium dichromate preparation by a carbonation method, high-quality anhydrous sodium chromate is successfully prepared by the method disclosed by the invention, with the main content being equal to or greater than 99.5% and the content of all impurities such as sulfate being less than 0.001%; moreover, the product does not absorb moisture or cake even if stored for a long term, and has good fluidity. The problems of sodium chromate tetrahydrate on easy moisture absorption, caking and poor fluidity are successfully solved. The method also brings into play the superiority of a production process of preparing sodium dichromate from a chromium salt by the carbonation method, so that two high-quality chemical products can be produced on one production line.

The invention provides a huff-and-puff oil production device with a submersible directly-driven screw pump. The huff-and-puff oil production device comprises an underground automatic water injection switch for realizing water injection and oil production channel switching and a submersible directly-driven screw pump, wherein a liquid outlet in the upper end of the underground automatic water injection switch is connected with an oil pipe, and a liquid inlet in the lower end of the underground automatic water injection switch is connected with an oil outlet in the upper end of the submersible directly-driven screw pump through the oil pipe; the submersible directly-driven screw pump comprises a screw pump, a flexible shaft, an upper protect tor, a lower protector, a submersible motor and a centralizer which are non-coaxially connected from top to bottom; the upper end of the screw pump is connected with the lower end of the underground automatic water injection switch; and the screw pump and the submersible motor are respectively electrically connected to a submersible cable outside a wellhead. The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like; and due to the adoption of the lifting way, the huff-and-puff oil production device has the characteristics of low rotating speed and large torque and is suitable for a well with low liquid quantity, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, and the economic benefit can be effectively increased.

The invention belongs to the welding field of surfacing prefabricated internal joint bimetallic pipes, in particular to a bimetallic welding construction process method for surfacing prefabricated internal joint bimetallic pipes, which adopts double U-shaped butt joint grooves and melts the prefabricated The blunt edge of the inner joint layer is fused to form the root welding layer, which realizes the reliable connection of the corrosion-resistant alloy prefabricated inner joint layer, and forms the transition welding layer through the melting and leveling of the metal in the surfacing welding fusion zone, and realizes the transition to the low carbon steel welding layer. Transition, the weld seam welding is completed through the filling cover of the low carbon steel welding material in the weld seam; the bimetallic weld seam completed by this method solves the technical problem that the low carbon steel welding material cannot weld the stainless steel base material, and avoids the prefabricated interior The risk of electrochemical corrosion caused by the melting of the corrosion-resistant alloy layer into the low-carbon steel component ensures the physical and chemical properties of the weld; this process is important for the popularization and application of corrosion-resistant alloy prefabricated internal joints and internal anti-corrosion pipelines, and to improve the life of the pipeline effect.

The invention belongs to the technical field of mechanical oil production and particularly provides a huff-and-puff oil production device with an electric submersible reciprocating pump. The huff-and-puff oil production device comprises an underground automatic water injection switch (6) for realizing water injection and oil production channel switching and an electric submersible reciprocating pump, wherein a liquid outlet (9) in the upper end of the underground automatic water injection switch (6) is connected with an oil pipe (4), and a liquid inlet (10) in the lower end of the underground automatic water injection switch (6) is connected with an oil outlet in the upper end of an electric submersible reciprocating pump through the oil pipe (4). The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like as comparison with the traditional huff-and-puff oil production process. In addition, due to the adoption of an electric submersible reciprocating pump (a linear motor) device adopted in a lifting way, underground driving link is omitted, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, the huff-and-puff oil production device is suitable for a well with low liquid quantity, and the economic benefit can be effectively increased.