Additional water treatments

When low boiling ingredients such as ethylene glycol are used, a special provision in the form of a partial condenser is needed to return them to the reactor. Otherwise, not only is the balance of the reactants upset and the raw material cost of the resin increased, but also they become part of the pollutant in the waste water and incur additional water treatment costs. Usually, a vertical reflux condenser or a packed column is used as the partial condenser, which is installed between the reactor and the overhead total condenser, as shown in Figure 3. The temperature in the partial condenser is monitored and maintained to effect a fractionation between water, which is to pass through, and the glycol or other materials, which are to be condensed and returned to the reactor. If the fractionation is poor, and water vapor is also condensed and returned, the reaction is retarded and there is a loss of productivity. As the reaction proceeds toward completion, water evolution slows down, and most of the glycol has combined into the resin stmcture. The temperature in the partial condenser may then be raised to faciUtate the removal of water vapor. 

Spray water loss, resulting in costly additional water treatment for the makeup water... 

Barium hydroxide (hydrate) [Ba(OH)2] exists in several forms and has many uses in oil and grease additives, water treatment, vulcanization of rubber, and the manufacture of soaps, beet sugar, glass, and steel. 

Uses Intermediate for mfg. of diphosphonic acids and phosphite salts used as pesticides, chelates, plastic additives, water treatment chems. restricts color formation in... 

The mixture of vinyl silane, peroxide and catalyst is introduced either in the feed hopper or directly to the polymer melt. Moisture crosslinking is similar to Sioplas, in a water or steam bath and new types of polymers also permit ambient curing without additional water treatment. 

The chemical industry has been opening new markets for zinc oxide. Examples are lubricating oil additives, water treatment and catalysts. For photocopying, photoconductivity is a unique electronic property of zinc oxide. 

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