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Title: Carbon particles

Abstract

A method and apparatus whereby small carbon particles are made by pyrolysis of a mixture of acetylene carried in argon. The mixture is injected through a nozzle into a heated tube. A small amount of air is added to the mixture. In order to prevent carbon build-up at the nozzle, the nozzle tip is externally cooled. The tube is also elongated sufficiently to assure efficient pyrolysis at the desired flow rates. A key feature of the method is that the acetylene and argon, for example, are premixed in a dilute ratio, and such mixture is injected while cool to minimize the agglomeration of the particles, which produces carbon particles with desired optical properties for use as a solar radiant heat absorber.

Inventors:
 [1]
  1. (Oakland, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865033
Patent Number(s):
4452771
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
carbon; particles; method; apparatus; whereby; pyrolysis; mixture; acetylene; carried; argon; injected; nozzle; heated; tube; amount; air; added; prevent; build-up; tip; externally; cooled; elongated; sufficiently; assure; efficient; desired; flow; rates; key; feature; example; premixed; dilute; ratio; cool; minimize; agglomeration; produces; optical; properties; solar; radiant; heat; absorber; desired flow; nozzle tip; flow rates; flow rate; carbon particles; optical properties; radiant heat; apparatus whereby; solar radiant; key feature; /423/

Citation Formats

Hunt, Arlon J. Carbon particles. United States: N. p., 1984. Web.
Hunt, Arlon J. Carbon particles. United States.
Hunt, Arlon J. Sun . "Carbon particles". United States. https://www.osti.gov/servlets/purl/865033.
@article{osti_865033,
title = {Carbon particles},
author = {Hunt, Arlon J.},
abstractNote = {A method and apparatus whereby small carbon particles are made by pyrolysis of a mixture of acetylene carried in argon. The mixture is injected through a nozzle into a heated tube. A small amount of air is added to the mixture. In order to prevent carbon build-up at the nozzle, the nozzle tip is externally cooled. The tube is also elongated sufficiently to assure efficient pyrolysis at the desired flow rates. A key feature of the method is that the acetylene and argon, for example, are premixed in a dilute ratio, and such mixture is injected while cool to minimize the agglomeration of the particles, which produces carbon particles with desired optical properties for use as a solar radiant heat absorber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Patent:

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