William Marsh Rice University

Baker Hughes Corporation

Baker Hughes, a Ge Compnay, LLC

Baker Hughes Holdings LLC

Zhenning Gu

Richard E Smalley

Robert H Hauge

John L Margrave

Roger D Metzler

Bradley G Harrell

Valery Khabashesku

Howard K Schmidt

Kenneth A Smith

Joseph L Stark

W Carter Kittrell

Jian Zou

Kirk Jeremy Ziegler

Yuemei Yang

Jingshe Song

Wan-Ting Chiang

Ksenija Babic

Valery Aleksandrovich Davydov

Aleksandra Viktorovna Rakhmanina

Lyudmile Stepanovna Kashevarova

Wilber Carter Kittrell

Urs Rauwald

A chemically modified polysaccharide additive may be introduced to a wastewater stream in an effective amount to remove oil-coated particulates and/or heavy metal contaminants from the wastewater stream. The chemically modified polysaccharide includes at least one sulfur-containing moiety and/or nitrogen-containing moiety and the contaminants may be removed by using this chemically modified polysaccharide to capture the contaminants and separating out the captured contaminants.

Methods and compositions for removing contaminants from wastewater streams

The present disclosure is related to a family of oil-based dispersions of organic and inorganic metal compounds for use as a hydrogen sulfide scavenger in asphalt, and the preparation thereof. These dispersions comprise organic and inorganic metal compounds, organic solvents, an organoclay suspension agent, an emulsifier and optionally a polymeric stabilizer. The organic and inorganic metal compounds are in the form of micron-sized particles. Copper-based dispersions are particularly effective at reducing the hydrogen sulfide emission of asphalt in the presence of polyphosphoric acid.

Metal-based hydrogen sulfide scavenger and method of preparing same

Elimination and/or mitigation of fouling in a vapor transport systems, such as vent lines and scrubber feed lines may be accomplished using an antifouling additive. The method for employing the antifouling additive includes introducing into the vapor transport system an additive including a polar solvent and corrosion inhibitor wherein: the vapor transport system is substantially water free; the vapor transport system is used to transport acidic materials; the additive is a liquid at vapor transport system operating conditions; and the additive is stable at the vapor transport system operating conditions.

Method for inhibiting fouling in vapor transport system

According to some embodiments, the present invention provides a method for attaining short carbon nanotubes utilizing electron beam irradiation, for example, of a carbon nanotube sample. The sample may be pretreated, for example by oxonation. The pretreatment may introduce defects to the sidewalls of the nanotubes. The method is shown to produces nanotubes with a distribution of lengths, with the majority of lengths shorter than 100 tun. Further, the median length of the nanotubes is between about 20 nm and about 100 nm.

Bulk cutting of carbon nanotubes using electron beam irradiation

The present invention is directed towards the fluorination of polymeric Cand towards the chemical and physical modifications of polymeric Cthat can be accomplished through fluorination.

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The present invention relates to an all gas-phase process for the purification of single-wall carbon nanotubes and the purified single-wall carbon nanotube material. Known methods of single-wall carbon nanotube production result in a single-wall carbon nanotube product that contains single-wall carbon nanotubes in addition to impurities including residual metal catalyst particles and amounts of small amorphous carbon sheets that surround the catalyst particles and appear on the sides of the single-wall carbon nanotubes and 'ropes' of single-wall carbon nanotubes. The purification process removes the extraneous carbon as well as metal-containing residual catalyst particles. The process comprises oxidation of the single-wall carbon nanotube material, reduction and reaction of a halogen-containing gas with the metal-containing species. The oxidation step may be done dry or in the presence of water vapor. The present invention provides a scalable means for producing high-purity single-wall carbon nanotube material.

Gas-phase process for purifying single-wall carbon nanotubes and compositions thereof

A method for cutting single-wall carbon nanotubes involves partially fluorinating single-wall carbon nanotubes and pyrolyzing the partially fluorinated nanotubes in an inert atmosphere or vacuum up to about 1000&#xb0; C. The nanotubes are optionally purified before cutting. The partial fluorination involves fluorinating the nanotubes to a carbon-fluorine stoichiometry of CF, where x is up to about 0.3. The invention also relates to the derivatization of fluorinated and cut single-wall carbon nanotubes. The single-wall carbon nanotubes can be cut to any length depending on the fluorination and pyrolysis conditions. Short nanotubes are useful in various applications, such as field emitters for flat panel displays and as 'seeds' for further nanotube growth.

Method for cutting single-wall carbon nanotubes through fluorination

Growing community of inventors

Sugar Land, TX, United States of America

Zhenning Gu