43results about How to "Long-term continuous and stable operation" patented technology

The invention relates to a method and equipment for nylon 66 short-flow continuous polymerization. The method comprises the steps of carrying out heating, evaporation, concentration and polycondensation of 30-70% of a nylon 66 salt solution in a normal pressure pre-polypolycondensation tower by adopting a reaction distillation method to obtain a prepolymer with a polymerization degree of 5-50 (preferably 20-40) and equimolar terminal carboxy group and terminal amine group, and allowing the prepolyer to directly produce a polymer with a polymerization degree meeting technical indicators without flash distillation. A falling film devolatilization method is adopted in the polycondensation kettle to accelerate distillation out of condensation water, reduce reaction temperature, shorten reaction time and reduce gel; and the falling liquid film is used to seal and cover the kettle wall to avoid scarring of the kettle wall. Compared with the traditional nylon 66 continuous polymerization device, the method and the equipment provided by the invention has the advantages of short process, large single line scale, less investment, low operating cost, good product quality, long continuous operation cycle, and environmental friendliness.

In a seawater treatment method which comprises subjecting seawater to coagulation with a coagulant and solid-liquid separation and then conducting RO treatment of the resulting seawater, the present invention makes it possible to provide high-quality feed water for the RO treatment, even when the amount of the coagulant added is reduced. The use of this high-quality feed water enables the RO treatment to be stably conducted over a long period. This seawater treatment method is a method for pre-treating seawater prior to membrane separation, said method being characterized by adding a cationic organic flocculant and / or an inorganic coagulant to seawater to conduct reaction, thereafter adding an alkaline solution of a high-molecular compound which has a phenolic hydroxyl group and which is insolubilized under a high salt concentration to the resulting seawater to conduct agglomeration, and then subjecting the thus treated seawater to solid-liquid separation. The treated seawater obtained by the method is thereafter desalinated by membrane separation.

The invention discloses a processing method for electro-adsorption demineralized water, which belongs to the water processing with an electrochemical separation method. The processing method for the electro-adsorption demineralized water comprises the following technical processes of energizing working, discharging for standing, carrying out short circuit and regenerating, and has the characteristics that industrial hydrochloric acid is injected into an electro-adsorption module (1) under the condition of continuously feeding water and energizing before the technical process of discharging for standing; water injected with the hydrochloric acid is controlled to just fill in the electro-adsorption module without being discharged out of the system; in addition, the pH (Potential Of Hydrogen) value range of the electro-adsorption module is controlled to 2.0-6.0; while the hydrochloric acid is injected, yielding water normally enters a water production tank (6) and is switched to a middle water discharging tank B (12); and after the electro-adsorption module is full of the hydrochloric acid, water is stop to feed, and the power supply is cut off to enter the technical processes of discharging for standing and regenerating. The invention provides the processing method for the electro-adsorption demineralized water, which has the advantages of simple step and excellent electrode regeneration effect, the electro-adsorption module does not scale, and an electro-adsorption demineralizer is guaranteed to continuously and stably operate for a long term.

The invention relates to an additive used in the preparation process of methionine and a preparation method of methionine. The additive provided by the present invention is the mixture that comprises A, B and C component, and A component has the structural formula represented by following general formula (1); B component has the structural formula represented by following general formula (2): C component is Silicone oil; RCON(CH 3 )CH 2 CH 2 SO 3 Na(1) The preparation method of methionine provided by the present invention comprises crystallization and / or recrystallization of methionine in the presence of the additive provided by the present invention. The additive provided by the invention has uniform emulsification, good stability, can be used stably for a long time, and is suitable for continuous crystallization process. The prepared methionine has good crystal form, high bulk density and good fluidity. In addition, according to the preparation method of methionine of the present invention, the crystallization system can run continuously and stably for a long time without obvious foaming phenomenon, and the crystallization process of the methionine product proceeds smoothly.

The invention discloses an air flotation separation device, comprising an external cylinder (2), a rotational flow mixed cylinder (8), a first slag-retaining cylinder (7), a first scum drainage pipe (4) and a scum collecting guide plate (10); wherein, the bottom end of the first slag-retaining cylinder (7) and the bottom of the external cylinder (2) have spacing so as to form a water passage; thebottom of the side wall of the rotational flow mixed cylinder (8) is connected with a water inlet pipe (16) which enters in tangent direction; the periphery of the top of the external cylinder (2) isprovided with a clean water collecting trench (14); and the scum collecting guide plate (10) is a strip-typed plate in an involute shape, with the involute direction right opposite to the water rotational flow direction in the rotational flow mixed area (A). Compared with the prior art, the air flotation separation device does not need to add external energy cleaning systems, achieves the object of long-term continuously and stably running, and ensures that the requirement that the micro air bubbles adhere to the dispersed oil, emulsified oil and dissolved oil of small particle size as much as possible is met, thus achieving the object of high-efficiency separation of oil from water. The air flotation separation device is especially suitable for low-consistency water containing oil.

The invention discloses an electroadsorption desalting regeneration system and an electroadsorption desalting regeneration method, which relate to the field of sewage treatment and are used for solving the problem of a relative poor regeneration effect of an electroadsorption module in the prior art. The system comprises an electroadsorption module to be regenerated, an acid water tank for storing acid liquor, an acid-washing short connected regeneration unit for washing the electroadsorption module by using the acid liquor in the acid water tank, an acid discharging unit for discharging the acid liquor generated after the washing of the acid-washing short connected regeneration unit, a water tank for storing water, a regeneration washing unit for washing the electroadsorption module by using the water stored in the water tank, and a drainage unit for draining the water generated after the washing of the regeneration washing unit. The method comprises the following steps of: performing acid-washing regeneration; discharging the acid liquor; performing regeneration washing; and draining the water. In the invention, an acid-washing regeneration process is added, so that positive ions on a group of the electroadsorption module can be completely displaced to fulfill the aim of complete regeneration.

The invention discloses a method and a system for desalting and backwashing through electric absorption, belonging to the field of water treatment. The invention aims at solving the problem that the prior art can not ensure both the regeneration effect of an electric absorbing module and higher water yield. The method comprises the following steps of: backwashing the electric absorbing module by water recycled in the previous period, re-backwashing the electric absorbing module by raw water, and recycling water obtained by backwashing through the raw water for backwashing in the next period. The system comprises an electric absorbing module to be regenerated, a recycled water tank, a recycled water backwashing unit, a raw water tank, a raw water backwashing unit and a recycling water unit. By increasing the steps and units on the basis of the prior art, the invention realizes both the regeneration effect of the electric absorbing module and the higher water yield.

The invention relates to a preparation method of a polymer, particularly relates to a polymethyl methacrylate (PMMA) continuous production process for long-time operation without accumulation, and belongs to the technical field of polymer preparation. A polymeric kettle and a stirring warming kettle which enter from the bottom and leave from the top are used, and use a ribbon-type stirrer and chromeplated or polished inner walls; a small amount of an inert solvent is added in the reaction mixture to increase the fluidity of a mixture system; an extruder screw and the inner walls are chromeplated; and by such means as adding a circulation loop and adding a polymerization inhibitor between a distillation column reboiler and a waste liquid tank, the polymer is prevented from being accumulated in a container or a pipeline when the PMMA continuous body is polymerized, and long-time continuous and stable operation is ensured.

The present invention provides a method for evaluating reverse osmosis membrane supply water, a method for water treatment and a water treatment device. The invention can evaluate the quality of reverse osmosis membrane supply water in a short time simply and accurately, thereby operating the water treatment device with the reverse osmosis membrane device stably in a long term. The reverse osmosis membrane supply water evaluation method for evaluating the quality of water supplied to the reverse osmosis membrane device is characterized in that the method detects fluorescence intensity of the reverse osmosis membrane supply water and evaluates the water quality based on the fluorescence intensity detection result. The water treatment device with the reverse osmosis membrane device is operated and managed based on the evaluation result.