Abstract: The present disclosure is directed to a method and system for preventing carry-over of C2+ hydrocarbon mist from an NGL recovery column in an LNG plant. A wash loop of recirculating liquid hydrocarbon is provided at the upper portion of the NGL column. A sidestream of liquid hydrocarbons collected within the column is removed from the column and pumped to sufficient height to be returned to the column at a temperature substantially equivalent to the temperature of liquid with the upper portion of the column. In one embodiment, liquid hydrocarbons of a desired composition can be loaded and reloaded to a working medium holding drum in fluid communication with the top of the column. The working medium can be selected to be sufficiently heavy not to be lost from the column and to have a suitable freezing point to avoid freezing within the column.

Abstract: This invention pertains to an apparatus for controlling the diameter of a glass bait tube during the deposition of glassy layers therein. The exhaust end of the bait tube is connected to a vented chamber. A gas source is connected to the chamber by a mass flow controller. A moving hot zone is generated within the bait tube while reactant gases flow therethrough in order to form uniform glassy deposits within the bait tube. An outer diameter monitor measures the bait tube diameter within the hot zone and provides an output signal to a controller which compares the output signal to a set point and provides a control signal to the mass flow controller. By varying the flow of gas into the chamber, the pressure within the bait tube is maintained at the level necessary to provide the desired tube diameter.