8results about How to "Increase responsiveness" patented technology

The invention relates to the technical field of air detection, and particularly discloses a method for measuring formaldehyde content in indoor air, which is used for measuring indoor formaldehyde gas by potentiometric titration and comprises the following steps: firstly, preparing a K2Cr2O7 standard solution, a Fe < 2 + > standard solution and a formaldehyde standard solution; secondly, taking a K2Cr2O7 standard solution as an absorption liquid of formaldehyde gas, adding sulfuric acid and distilled water, heating in a water bath, transferring into a gas sampler, and sampling air to obtain a sample collection liquid; and placing the sample collection solution in a water bath kettle, continuously heating, titrating the excess K2Cr2O7 and formaldehyde blank sample by using an automatic potentiometric titrator by using a Fe < 2 + > standard solution as a titrating solution, and calculating the content of formaldehyde in the air. The method disclosed by the invention is simple to operate and accurate in determination, the reaction speed can be increased, the reaction degree can be improved, the lowest detection limit can reach 0.006 mg / m < 3 >, and the method can be used for determining the indoor formaldehyde content. The problems that in the prior art, operation is tedious, the duration time is long, and the detection limit is too high are solved.

The invention belongs to the field of waste liquid recycling, and discloses a method for preparing potassium fluosilicate by using mixed waste acid, which comprises the following steps: S1, silica fume acidification pretreatment: soaking silica fume in an acid solution for acidification, carrying out precipitation separation on the silica fume, drying, and grinding to obtain acidified silica fume; s2, mixing the raw materials: uniformly mixing the acidified silica fume and the silicon dioxide powder; s3, preparation of fluosilicic acid: adding a mixture of acidified silica fume and silicon dioxide powder into the mixed waste acid, and uniformly stirring by a mechanical stirrer; and S4, preparation of potassium fluosilicate: adding a potassium chloride saturated solution into the fluosilicic acid solution to generate potassium fluosilicate precipitate. The method has the advantages and effects of being high in fluorine ion utilization efficiency, low in production cost and high in finished product purity.

The application discloses a tobacco extract preparation method, which comprises the following steps: (1) one-time feeding: preparing a carbonated salt-amino acid mixed aqueous solution, uniformly applying the mixed aqueous solution to tobacco raw materials, and standing at room temperature; (2) drying: performing heating treatment on the tobacco raw materials after feeding, and drying; (3) secondary feeding: uniformly applying a polyol to the dried tobacco raw materials; (4) extrusion: performing extrusion and puffing treatment on the tobacco raw materials after feeding, and obtaining treated tobacco raw materials; and (5) extraction: performing extraction and separation on the treated tobacco raw materials, and obtaining a tobacco extract. The carbonated salt-amino acid solution can improve feeding uniformity, improve the pH of the system to reduce nicotine, drying is beneficial to subsequent reactions, the polyol improves material fluidity and prevents extrusion die blockage, extrusion and puffing high-temperature and high-pressure degrade macromolecules, and the tobacco aroma is improved. The extract can be used for heat cigarettes, the aroma is richer, and the odor and irritability are obviously reduced.

The present application relates to the technical field of magnetic material, in particular to a kind of reverse microemulsion composition, iron oxide magnetic particle reverse microemulsion and its preparation method and application, core-shell type iron oxide magnetic particle and its preparation method.The composition contains iron salt reverse microemulsion component and alkaline reverse microemulsion component;The iron salt reverse microemulsion component contains the following components independently stored or more than two mixed storage: cationic surfactant A, anionic surfactant A, soluble iron source, organic solvent A, water;The alkaline reverse microemulsion component contains the following components independently stored or more than two mixed storage: cationic surfactant B, anionic surfactant B, soluble alkali, organic solvent B, water.The reverse microemulsion composition of anion / cation complex surfactant is proposed in the present application, and relatively small size reverse microemulsion droplet can be prepared.

This invention discloses a method for reducing the grindability index of raw coke. After the carbonization feed is completed, the heating furnace heat load is maintained, and steam or heavy oil is introduced into the furnace tubes. The heated steam or heavy oil is then sent to the carbonization tower. Simultaneously, the carbonization tower is restored to a slightly positive pressure within 30-60 minutes, and the carbonization reaction temperature of the material is maintained to continue the carbonization reaction. Then, the raw coke exiting the carbonization tower is sent to a carbonization furnace or brick kiln for calcination. This invention, based on the raw coke production process and the principles affecting the grindability index of raw coke, produces raw coke with an adjustable grindability index suitable for manufacturers, reducing the time spent by manufacturers in raw material selection.

The application relates to the technical field of cation exchangers, in particular to a cation exchanger convenient for backwashing and a use method thereof, which comprises a filter layer, a top cover and a tank body, the tank body top is detachably connected with the top cover through bolts, the filter layer is arranged in the tank body, and resin is arranged in the filter layer; a fourth channel communicated with the tank body side wall is arranged below the filter layer; a third channel is arranged at the tank body bottom, a tower type orifice plate cover is arranged at the tank body top, the tower type orifice plate cover is fixed with the top cover inner cavity top, and a first channel and a second channel are communicated with the tower type orifice plate cover after penetrating through the top cover. The tower type orifice plate cover is used to guide the input water to be purified, which can prevent the input water pressure from being too large to damage the resin and can make the water to be purified contact different resins more uniformly.

The invention provides a semiconductor advanced packaging thick negative photoresist stripping liquid and a photoresist removing method, and the semiconductor advanced packaging thick negative photoresist stripping liquid comprises the following components by mass: 70-90% of an organic solvent, 0.1-3% of a strongly alkaline organic base, 1-5% of a cosolvent, 1-10% of a latent solvent, 0.1-1% of a surfactant, 1-5% of a metal corrosion inhibitor, and the balance of water. The alkali in the film stripping liquid adopts the organic alkali with the pKa value larger than 20, the reaction degree with the photoresist acidic substance is improved, meanwhile, the usage amount can be reduced, the solvent proportion of the film stripping liquid is increased, PR loading is improved, thick glue can be effectively stripped, and the stripping efficiency is high.

The invention relates to a method for synthesizing piperazine-N, N '-bis (2-hydroxypropanesulfonic acid) dihydrate, and belongs to the technical field of organic chemistry. The method comprises the following steps: opening a channel A and a channel B, enabling piperazine and sodium 3-chloro-2-hydroxypropanesulfonate to react in a micro-channel reactor under the catalysis of sodium hydroxide to obtain piperazine-N, N '-bis (2-hydroxypropanesulfonic acid) disodium salt, enabling the reaction liquid to enter a neutralization unit after the reaction is finished, opening a channel C, adjusting the pH value of the reaction liquid to be 5-6, desalting, and crystallizing to obtain the piperazine-N, N'-bis (2-hydroxypropanesulfonic acid) disodium salt. The invention relates to N, N '-bis (2-hydroxy propanesulfonic acid) dihydrate. Anhydrous piperazine and sodium 3-chloro-2-hydroxypropanesulfonate are adopted as raw materials, the reaction is carried out in the microchannel reactor, the continuous and efficient reaction can be realized, the reaction degree is high, and the content after crystallization and purification can meet the index requirement.