San Francisco, CA, United States

Bechtel Corporation

www.bechtel.com/
San Francisco, CA, United States

Bechtel Corporation is the largest construction and civil engineering company in the United States, ranking as the 4th-largest privately owned company in the United States. Its headquarters are in the South of Market, San Francisco. Wikipedia.


Time filter

Source Type

Systems and methods for enhanced separation of H2S and NH3 in an H2S stripper using carbon dioxide and/or an inert gas.


Patent
Bechtel Corporation | Date: 2015-03-05

Systems and methods for ammonia purification in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.


Patent
Bechtel Corporation | Date: 2017-01-11

Systems and methods for ammonia purification in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.


Systems and methods for recovering light hydrocarbons from refinery waste gas using a back-end turboexpander to generate a higher recovery of the light hydrocarbons for use as petrochemical feedstock and to remove the liquid light hydrocarbons before entering the turboexpander.


Patent
Bechtel Corporation | Date: 2017-02-17

Systems and methods for multi-stage refrigeration in mixed refrigerant and cascade refrigeration cycles using one or more liquid motive eductors.


Systems and methods for safe on-line pigging decoking of a coker furnace tubes and which also permits on-line spalling operations.


Systems and methods for enhanced separation of H2S and NH3 are provided. Specifically, the present invention includes a method for separating hydrogen sulfide and ammonia, which comprises: i) introducing a fluid mixture of the hydrogen sulfide and the ammonia into a hydrogen sulfide stripper; ii) introducing a stripping gas into the hydrogen sulfide stripper, wherein the stripping gas comprises at least one of a carbon dioxide and an inert gas; and iii) separating most of the hydrogen sulfide and the ammonia in the fluid mixture using the stripping gas in the hydrogen sulfide stripper, which forms a hydrogen sulfide stripper overheads stream and a hydrogen sulfide stripper bottoms stream.


Patent
Bechtel Corporation | Date: 2017-04-12

Systems and methods for reducing the capital and operating costs of a smelting process system and improving the environmental impact of the smelting process using an IGT system to remove and filter environmentally hazardous gases and particulates from each electrolytic cell in the smelting process system. A system for smelting alumina, which comprises: i) an electrolytic cell comprising a housing wherein an upper area of the housing represents a superstructure; ii) a porous floor within the superstructure for supporting a fluidized bed comprising at least one of non-fluorinated alumina and fluorinated alumina; and iii) a ventilation system operatively connecting an opening in the superstructure to an open environment outside the electrolytic cell, wherein the ventilation system comprises a scrubbed process gas plenum positioned within the superstructure above the porous floor and a scrubbed process gas duct.


Systems and methods for the external processing flash zone gas oil by recycling it through a vacuum residuum hydroprocessing unit before reentering the delayed coking process.


Patent
Bechtel Corporation | Date: 2016-09-01

Methods for defoaming in hydrocarbon processes include the steps of providing a defoaming agent, and introducing the agent into a hydrocarbon process to inhibit or control foaming in the hydrocarbon process. These methods may be particularly useful in coking processes, especially as to foaming in coke drums. In certain embodiments, defoaming agents may comprise a plurality of carbon nanoparticles. In some embodiments, drag reducing agents may comprise high-molecular weight alkanes. Advantages include, but are not limited to, more efficient and effective foam inhibition, reduced or eliminated product contamination, reduced or eliminated catalyst poisoning, increased refinery production rate, debottlenecking the coker, and reduced cost and consequences of applying too much antifoam.

Loading Bechtel Corporation collaborators
Loading Bechtel Corporation collaborators