Abstract: This invention relates to a continuous process for the preparation of slush hydrogen. The process comprises substantially continuously injecting liquid hydrogen at a temperature slightly above its triple point temperature into a slush hydrogen generator; forming solid hydrogen by removing hydrogen vapor from the slush hydrogen generator; fracturing and dispersing surface solid as it is formed into the slush; concentrating the crystalline solid particles in the slush to a level of at least 30%, and preferably from 45 to 60%, by weight; and substantially continuously removing the slush hydrogen from said slush hydrogen generator at a rate such that a substantially constant level of slush is maintained in said slush hydrogen generator.

Abstract: This invention relates to a continuous process for the preparation of slush hydrogen by the freeze-thaw technique. The process comprises substantially continuously injecting liquid hydrogen at or near its triple point temperature into a slush hydrogen generator; forming solid hydrogen by removing hydrogen vapor from the slush hydrogen generator; alternately adjusting the pressure in the slush hydrogen generator to a pressure below the triple point of hydrogen and then to a pressure slightly above the pressure at the triple point thereby effecting formation and dispersion of solids in said slush; concentrating the crystalline solid particles in the slush to a level of at least 30%, and preferably from 45 to 60%, by weight; and substantially continuously removing the slush hydrogen from said slush hydrogen generator at a rate such that a substantially constant level of slush is maintained in said slush hydrogen generator.

Abstract: A method for controlling the operation of a liquefied natural gas (LNG) process which utilizes gas turbine-driven refrigeration compressors is disclosed. A feedforward control system compensates for the effects of changes in ambient air temperature on the plant operating efficiency by periodically predicting a new temperature and resetting the set points of key feedback controllers in anticipation of this new temperature, thereby optimizing the operation of the plant and minimizing the specific fuel consumption at a given LNG production rate.