Drying desiccation

Alifdocken, v.t. wind up, roll up bundle, shock. (Ulfdfirren, v.t. dry, desiccate, anfdrkngen, v.t. press open force upon, anldrehen, v.t. screw open, untwist turn on (as gas) turnup (Ceram.) throw. 

Aluminum alloy coupons can be cleaned by immersion in 3% chromic acid and 5% phosphoric acid for 5 minutes. Then wash, dry, desiccate, and weigh. 

A sample with a w/c ratio of 0.4 by weight (which is at the threshold water content required for complete hydration of OPQ was cured for 28 days in a dry desiccator with a relative humidity of <5%. All surfaces of the sample except the top face were sealed with Parafilm, to promote evaporation of water through this surface only. This was done to disrupt the hydration process in this part of the sample and hence introduce some inhomogeneity into the cured sample. Following the cure period, the Parafilm was removed and the sample was dried in an oven for 48 h at 105°C in order to remove all evaporable water. Water penetration studies were then carried out as described below. 

Desiccant tests. Dried desiccant tests (as defined in USP XXIII for tight and well-closed packs), provide a useful indication of moisture ingress. Possible desiccants are dried calcium chloride and dried silica gel, but although these usually provide a useful comparison between packs, relating this information to the product may prove difficult, particularly if moisture sensitivity equates with some form of chemical degradation. 

Water is of cause necessary for growth but drying (desiccation) creates a mixture of osmotic stress and oxygen stress (too much oxygen). Short time desiccation leads to an accumulation to increased osmolarity in the vacuole by accumulation of polyols, as mannitol, in the vacuoles to counteract the loss of water. Prolonged desiccation case oxygen stress by oxidation of vital cellular compounds. This oxidation is caused by ... 

This observation was further verified by desorption data. In this case a thick cube of HlOO foam that had been immersed in sea water was cut into thin slices parallel to its top and bottom faces that were subsequently placed within dry desiccating... 

Figure 12-2. A typical natural gas dehydration plant employing dry desiccant in vertical...

Many gas-dehydration problems can be solved by using either a solid desiccant or a liquid system. However, the principal areas of application of the dry-desiccant processes are... 

Figure 12-5. Comparative initiai equipment costs fortypicai dry-desiccant and glycol dehydration processes in high-pressure natural gas service.

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