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Equation (6) indicates that secondary nucleation is significantly affected by the crystal surface area A (m2/l). The nucleation process is usually viewed as a process where copious amounts of fines are produced, resulting in a corresponding increase in the specific crystal surface area (m2/g) and crystal surface areaA olume of the crystallizer content (m /l). Results obtained in this study concur with this nucleation view. However, Brown (9) reported that nucleation can be suppressed at high crystal surface areas ( 20 m2/l). Brown s observation was not evident in this study though the seed density of 200 g/litre used in this study had a surface area of 25 m2/l. The lower dependence of second nucleation on supersaturation or concentration driving force, AC, in comparison to crystal surface area. A, is obvious from equation (6). 

Figure 1.2 shows a steam>cracked hydrogen cecovery and purification flow sheet by Joule Thomson expansion and heat transfer by means of plate-type heat exchangers. The hydrogen recovery rate, at a purity of 98 per cent volume, is thus more than 98J per cent, from an effluent whose inidffl content is 70 per cent I olume ... 

Oil content measurement the Bobcock method (oil flotation by heatin olume measurement)... 

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