Storage methods, multi-layer paper bags. Pay attention to moisture calcium lignosulphonate during storage. Synthetic methods to sulfite pulp waste as raw material, lime sedimentation, acid, filtered cleaning, the filtrate was concentrated derived. Purposes, can be used dispersants, emulsifiers, wetting agents. Used in industrial detergents, pesticides, herbicides, cement and concrete water reducer, dye diffusion agent, coke and charcoal calcium lignosulphonate processing, dyes and pigments, oil industry, wax emulsion. Preparation Methods: sulfite pulp waste as raw material, selection of treatment, condensed into solids after drying. Preparation of 0.15g / L of sample solution, according to IT-10 method, calcium sample should be positive.
The sample was dissolved in 50ml of water and 100mg, 10% acetic acid and: the 10% sodium nitrite solution 1ml, is placed after shaking at room temperature for 15min. Should appear brown. Take 0.1g / L sample was adjusted to pH5, in its UV absorption spectrum between 275nm and 280nm with a crest. calcium lignosulphonate sulfur content of the sample was accurately weighed 1.0g, was dissolved in a beaker containing 400ml of water. Slowly streamed through the liquid nitrogen surface. Add 10ml
of nitric acid, shaken vigorously until the solution is to calm response. Plus 70% perchloric acid 10ml, shake vigorously again. The uncovered beaker placed on a hot plate, heating the contents to a strong center of the bottom beaker becomes clarity.
Remove the beaker and cooled to room temperature. Add 5ml of hydrochloric acid, heated to a white smoke. After cooling water and diluted to approximately 100ml, 10% aqueous sodium hydroxide solution was adjusted to pH 6 ± 0.2. The solution calcium lignosulphonate was then heated to boiling, add 10% barium chloride solution 15ml, the solution in the beaker 90 ~ 95 ℃ steam bath overnight. After ash filter paper (No. 42, or equivalent product) filter, with 200ml warm water rinse. Then in a calcium lignosulphonate. The filter with the sedimentation velocity has been moved a constant crucible. Crucible and heated slowly to get rid of the moisture on the Bunsen burner.
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The sample was dissolved in 50ml of water and 100mg, 10% acetic acid and: the 10% sodium nitrite solution 1ml, is placed after shaking at room temperature for 15min. Should appear brown. Take 0.1g / L sample was adjusted to pH5, in its UV absorption spectrum between 275nm and 280nm with a crest. calcium lignosulphonate sulfur content of the sample was accurately weighed 1.0g, was dissolved in a beaker containing 400ml of water. Slowly streamed through the liquid nitrogen surface. Add 10ml
of nitric acid, shaken vigorously until the solution is to calm response. Plus 70% perchloric acid 10ml, shake vigorously again. The uncovered beaker placed on a hot plate, heating the contents to a strong center of the bottom beaker becomes clarity.
Remove the beaker and cooled to room temperature. Add 5ml of hydrochloric acid, heated to a white smoke. After cooling water and diluted to approximately 100ml, 10% aqueous sodium hydroxide solution was adjusted to pH 6 ± 0.2. The solution calcium lignosulphonate was then heated to boiling, add 10% barium chloride solution 15ml, the solution in the beaker 90 ~ 95 ℃ steam bath overnight. After ash filter paper (No. 42, or equivalent product) filter, with 200ml warm water rinse. Then in a calcium lignosulphonate. The filter with the sedimentation velocity has been moved a constant crucible. Crucible and heated slowly to get rid of the moisture on the Bunsen burner.
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