Transmission x-ray diffraction experiments have been carried out on solid helium grown in porous Vycor glass. Measurements were made at temperatures near 0.7 K and at pressures up to 162 bars. The crystalline phases of solid helium in Vycor are found to differ significantly from the bulk. At pressures from 70 bars through 98 bars the helium is polycrystalline and displays a single size broadened scattering peak. Above 98 bars the peak splits into three close peaks. No higher order peaks are seen at any pressure, indicating significant reduction in intensity due to disorder. A broad peak is present at all pressures, which may indicate the presence of amorphous solid. We tentatively identify the low-pressure phase as bcc and the high-pressure phase as coexistence between bcc and hcp. Size broadening indicates an average grain size of approximately 5 nm, comparable to the Vycor pore size.
Maxus Energy Corporation's Texas Panhandle Sunray Gas Plant (70 miles north of Amarillo) is unique, in that it utilizes practically every unit operation available to the gas processing industry (Table 1). This permits extensive processing and operating flexibility, and compliance with tighter environmental criteria, while minimizing operating expenses. Introduction Design efforts for a state-of-the-art gas processing plant began after all area third party processing negotiation efforts failed to produce the desired results. Management beliefs in strengthening core operating areas and gaining "control of one's destiny" were major influences for design criteria. Without alternate processing options available, operating flexibility was critical to keep field production flowing. Marketing considerations went into the design, allowing for future, tighter pipeline gas quality specifications. Recovery of helium as a finite natural resource (and a new source of revenue) was also desirable. With new processing equipment, higher NGL recoveries could maintain production rates in spite of decreased drilling activity in the Panhandle area. All facets of the design focused on increasing the Mid-Continent Division's current and future contribution to the Corporate "bottom line." PROCESS DESCRIPTIONS Sunray Gas Plant is two separate process trains; a cryogenic turboexpander unit for the sweet gas gathering system, and cold box technology for the sour, oil field gas gathering system (Figure 1). The sweet gas system arrives at the plant site between 225-250 psig and at seasonal ground temperatures. Except for water content, it already meets sales pipeline quality specifications. Therefore, the gas contacts with triethylene glycol (TEG) to remove enough water vapor to meet this, and can then bypass around the facility for direct raw sales to pipeline companies, if necessary. Normally, it enters plant compression for natural gas liquids (NGL) recovery. Up to three, 2500 BHP reciprocating compressors compress the feed gas to between 625-675 psig. P. 43^
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