70results about How to "Weak alkaline" patented technology

The invention discloses a system and method of recycling Fischer-Tropsch (F-T) synthesis waste water in indirect coal liquefaction production. The system comprises an ammonia-containing waste water storage device, an ammonia-containing waste water pump, a slurrying water tank, a slurrying water pump, a coal water slurry preparation device and an F-T synthesis device. The method comprises the steps: (1) neutralizing the ammonia-containing waste water and Fischer-Tropsch synthesis waste water to prepare slurrying water; and (2) returning the slurrying water to the coal water slurry preparation device for recycling. The system and the method have the advantages of being capable of greatly saving the chemical cost per year, greatly lightening the load for disposing sewage, solving the bottleneck problem on restraining the standard emission of chemical industry, and enabling the quality of the coal slurry not to frequently fluctuate due to the PH value of the slurrying water; proved by operation tests, the slurrying waste water obtained by neutralizing the ammonia-containing waste water and Fischer-Tropsch synthesis waste water has no any corrosion on flow passage components of the pump and the pipelines.

This invention presents a sulphurous acid generator which employs a combination of novel blending, contact and mixing mechanisms which maximize the efficiency and duration of contact between sulphur dioxide gas and water to form sulphurous acid in an open nonpressurized system, without employing a countercurrent absorption tower. The present invention also incorporates a novel high temperature concrete for use in constructing portions of the present invention.

The invention relates to the technical field of preparation of inorganic material-molecular sieve powder, and aims to provide a method for extending the synthesis range of a low-silicon-aluminum-ratio X type molecular sieve. The method is specifically a method for synthesizing the low-silicon-aluminum-ratio X type molecular sieve under the assistance of Na2CO3, and comprises the following steps: (1) preparing a directing agent: adding a silicon source into an aluminum source, an alkali source and water to prepare the directing agent; (2) synthesizing X type molecular sieve raw powder under the assistance of the Na2CO3. According to the method, the low-silicon-aluminum-ratio X type molecular sieve synthesized under the assistance of the Na2CO3 is of a pure phase and is relatively high in crystallinity; the adopted raw material Na2CO3 is an industrial raw material which is relatively low in corrosiveness, low-cost, readily available and suitable for large-scale production and application; particularly, the raw material Na2CO3 is relatively poor in alkalinity, the alkalinity can be kept stable within a wider synthesis proportioning operation range, and the alkalinity of a reaction system can be finely regulated.

This invention describes a sulfurous acid generator that employs a burn chamber that acts as a sulfur hopper. Generally, the burn chamber is not in sulfur communication with a sulfur hopper that is separate and distinct from the burn chamber. Instead, the burn chamber may be adapted to hold enough sulfur to allow the generator to produce sulfurous acid for a desired period of time without needing more sulfur to be added to the sulfur being combusted in the burn chamber.

The invention provides a nitrogen-sulfur co-doped carbon material with an electro-catalytic oxygen reduction activity and a preparation method of the carbon material, and belongs to the technical field of new material application. The technologic process comprises the following steps: performing ultrasonic cleaning on hairs with acetone, then shearing and crushing the hairs, pouring the hairs into a liner of a reaction kettle, adding analytically pure ammonia water, carrying out a hydrothermal degradation reaction, drying the solution obtained from hydrothermal degradation to obtain solid amino acid, mixing the solid amino acid with a template agent uniformly, thermally decomposing the mixture under an inert atmosphere, removing the template agent with diluted hydrochloric acid from the obtained sample, washing and drying, so as to prepare the nitrogen-sulfur co-doped carbon material. As the carbon material is prepared by taking hairs as the raw materials, the raw materials are simple and accessible, and low in cost; the selected template agent is low in cost and easy to remove; the preparation method is simple in technology; the prepared material is high in nitrogen and sulfur content, and has larger specific surface area, and is rich in pore structures; the nitrogen-sulfur co-doped carbon material prepared by the method shows up excellent properties in fuel cell cathode oxygen reduction and catalysis.