Cleaning process changes

Another quaHty control problem of multipurpose plants is the clean out for a product change. A test for residual cleaning solvents in the ppm level is a necessity. The best vaHdation of the cleaning process is to develop an analytical method that is able to find the previous product in the new product at a level of not more than 1 ppm. Tests should be mn on at least the first three batches. 

When coal is burned in a combustion unit, mineral matter undergoes major changes that lead to problems of clinker formation, fly ash, slagging, and boiler tube corrosion. The efficiency of a combustion unit is related to the amount of ash produced, since it is a diluent. On the positive side, ash has been utilized as a construction material and is a possible source of refractory materials, as cement additives, or as adsorbents for gas-cleaning processes. However, the composition of the ash must be known before it can be utilized in this way. 

Dry cleaning customers and employees of dry cleaning plants often complain about the chemical odor of perchloroethylene. More recently, with the recent process changes to reduce perc consumption and emission to the atmosphere, solvent turnover is minimized and complaints have arisen about a stale, stagnant and unpleasant odor that the customer relates to as clothes being cleaned in a dirty solvent (ISFA, 1999). Carbon dioxide dry cleaning clearly has an advantage here in that C02 is odorless. 

Placement of cleaning process into change management program Monitoring of cleaning... 

Previous research has also indicated that certain dyestuffs can react to particular external conditions and thus produce color changes. An overview of related research articles indicate that factors influencing color changes involve internal characteristics of the substrate and dye molecules in combination and external forces, such as light, humidity, heat, atmospheric contaminants, or other foreign substances introduced in wear and in cleaning processes (4,6,13,14,15). 

---