Abstract: The present invention relates to a method for producing of ultra-clean and high-purity aqueous hydrogen peroxide solution. Industrial grade hydrogen peroxide is filtered by SBA-15 molecular sieve with which the chelator is loaded, and then it is further filtered by a hyperfiltration membrane to obtain the ultra-clean and high-purity aqueous hydrogen peroxide solution. The method provided in the present invention overcomes the problems such as complexity of operation, high energy consumption and high content of impurities in the product, and is suitable for continuous production on a large scale because of its simple equipment, simple operation, low energy consumption and stable quality of the product.

Abstract: A method for producing of ultra-clean and high-purity electronic acetic acid is disclosed. The method including following steps: Step 1, industrial acetic acid is fast distilled; Step 2, filtering the fraction by membrane of 0.05˜0.3 ?m aperture; Step 3, rectification; Step 4, membrane filtration again. Due to the adoption of the technical scheme above, the ultra-clean and high-purity electronic grade acetic acid which purity is 99.8% is produced. The content of single metal ion is lower than 1 ppb and the content of particulates which is ?0.5 ?m is lower than 5 pcs/ml. The method of the invention will help to reduce energy consumption, to simplify the operation, and to achieve the high security.

Abstract: A method for producing of ultra-clean and High-purity electronic grade reagents is disclosed. The industrial grade reagents are chemically pretreated and filtered, and the colature is rectified. Heating the steam during the rectification to overheated steam, and filtering the overheated steam used the microporous membrane to remove the solid particulates. Condensing the overheated steam and the secondarily filter to remove the dust in the product. Due to the adoption of the technical scheme, the ultra-clean and High-purity isopropanol produced is in conformity with standard SEMI-C12 and the hydrochloric acid to standard SEMI-C8. And the method is applicable for the large-scale continuous production.

Abstract: The present invention provides a method for producing of ultra-clean and high-purity N-methyl pyrrolidone through using industrial grade N-methyl pyrrolidone as raw material. After the pretreatment, sorption and dehydration with 4A molecular sieve, twice membrane filtrations are carried out through using ?-cyclodextrin composite membrane for the first and 18-crown-6 composite membrane for the second. The filtrate is rectified under vacuum and filtered through using complexant composite microporous membrane to obtain the product. The ultra-clean and high-purity N-methyl pyrrolidone, produced by the method provided by the present invention, is up to the SEMI C8 standard. And the purity of the product is over 99.8%, the moisture content is less than 0.03%, and the content of single metal ion is less than 1 ppb. Comparing to the prior art, the present invention has the advantage such as the stable quality of the product, simple operation, and is suitable for industrial continuous production.

Abstract: A method of manufacturing ultra-pure sulfuric acid is described. Industrial sulfur trioxide is used as the raw material, gasifying it in a round gasifier, getting it gasified for the second time after condensation, sulfur trioxide gas has been purified. Absorbing the sulfur trioxide gas with the dilute sulfuric acid circularly, collect the target product of ultra-pure sulfuric acid. The main content of the ultra-pure sulfuric acid obtained by the method of the present invention can reach more than 96 wt %, the content of the impurities of metal ions, is in conformity with the SEMI C12 standard.

Abstract: The present invention relates to a method for producing of electronic grade aqueous ammonium fluoride solution. The industrial grade liquid ammonia is used as the raw material, when it is heated, the ammonia gas will be released. The organic gas impurities in the ammonia gas are removed by activated charcoal, and the oxygen is removed by deoxidizer, and then the high-purity ammonia gas is gotten. The high-purity hydrofluoric acid absorbs and reacts with the high-purity ammonia gas to obtain the electronic grade aqueous ammonium fluoride solution. The product has high-purity and stable quality, and it can be used in producing of electronic products directly. The method for producing of electronic grade ammonium aqueous fluoride solution provided by the present invention is suitable for continuous production on a large scale because of its simple operation.

Abstract: The present invention provides a method for continuous production of ultra-pure aqueous hydrogen peroxide solution. Industrial grade aqueous hydrogen peroxide solution as raw material is pretreated by macroporous adsorption resin, and then is brought into contact with a cation exchange resin, anion exchange resin to the first ion exchange. Then the material is brought into contact with multi-stage mixed cation and anion exchange resin columns, and is filtered by ultrafilter to obtain ultra-pure aqueous hydrogen peroxide solution. The method provided by the present invention has high security, simple operation, stable quality of product, and is suitable for continuously produce on a large scale.

Abstract: The present invention relates to a method for producing of ultra-clean and high-purity aqueous hydrogen peroxide solution. Industrial grade hydrogen peroxide is filtered by SBA-15 molecular sieve with which the chelator is loaded, and then it is further filtered by a hyperfiltration membrane to obtain the ultra-clean and high-purity aqueous hydrogen peroxide solution. The method provided in the present invention overcomes the problems such as complexity of operation, high energy consumption and high content of impurities in the product, and is suitable for continuous production on a large scale because of its simple equipment, simple operation, low energy consumption and stable quality of the product.

Abstract: A method for producing of ultra-clean and high-purity electronic acetic acid is disclosed. The method including following steps: Step 1, industrial acetic acid is fast distilled; Step 2, filtering the fraction by membrane of 0.05˜0.3 ?m aperture; Step 3, rectification; Step 4, membrane filtration again. Due to the adoption of the technical scheme above, the ultra-clean and high-purity electronic grade acetic acid which purity is 99.8% is produced. The content of single metal ion is lower than 1 ppb and the content of particulates which is ?0.5 ?m is lower than 5 pcs/ml. The method of the invention will help to reduce energy consumption, to simplify the operation, and to achieve the high security.

Abstract: The present invention provides a method for producing of ultra-clean and high-purity N-methyl pyrrolidone through using industrial grade N-methyl pyrrolidone as raw material. After the pretreatment, sorption and dehydration with 4A molecular sieve, twice membrane filtrations are carried out through using ?-cyclodextrin composite membrane for the first and 18-crown-6 composite membrane for the second. The filtrate is rectified under vacuum and filtered through using complexant composite microporous membrane to obtain the product. The ultra-clean and high-purity N-methyl pyrrolidone, produced by the method provided by the present invention, is up to the SEMI C8 standard. And the purity of the product is over 99.8%, the moisture content is less than 0.03%, and the content of single metal ion is less than 1 ppb. Comparing to the prior art, the present invention has the advantage such as the stable quality of the product, simple operation, and is suitable for industrial continuous production.

Abstract: The present invention provides a method of manufacturing ultra-pure sulfuric acid. Industrial sulfur trioxide is used as the raw material, gasifying it in a round gasifier, getting it gasified for the second time after condensation, sulfur trioxide gas has been purified. Absorbing the sulfur trioxide gas with the dilute sulfuric acid circularly, collect the target product of ultra-pure sulfuric acid. The main content of the ultra-pure sulfuric acid obtained by the method of the present invention can reach more than 96 wt %, the content of the impurities of metal ions is in conformity with the SEMI C12 standard.

Abstract: A method for producing of ultra-clean and High-purity electronic grade reagents is disclosed. The industrial grade reagents are chemically pretreated and filtered, and the colature is rectified. Heating the steam during the rectification to overheated steam, and filtering the overheated steam used the microporous membrane to remove the solid particulates. Condensing the overheated steam and the secondarily filter to remove the dust in the product. Due to the adoption of the technical scheme, the ultra-clean and High-purity isopropanol produced is in conformity with standard SEMI-C12 and the hydrochloric acid to standard SEMI-C8. And the method is applicable for the large-scale continuous production.