United States Patent 6,302,997 - Process for producing a pulp suitable for papermaking from nonwood fibrous materials

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" rowspan="2" width=140 BGCOLOR="#009900" TEXT="#F7F7FF"> <div> <IMG SRC="2365a310.jpg" border=0 width="90" height="49" ALT="HC logo" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <div> <A HREF="index.htm" TARGET="_top" TITLE="HurterConsult Incorporated">Home</A></div> <div> <A HREF="philosophy.htm" TARGET="_top" TITLE="Our Process Technology Design Philosoph">Philosophy</A></div> <div> <A HREF="expertise.htm" TARGET="_top" TITLE="Our Areas of Expertise">Expertise</A></div> <div> <A HREF="services.htm" TARGET="_top" TITLE="Our Scope of Services">Services</A></div> <div> <A HREF="cellulosic_biofuels.htm" TARGET="_top" TITLE="Cellulosic Biofuel">Cellulosic Biofuel</A></div> <div> <A HREF="references.htm" TARGET="_top" TITLE="HurterConsult Project References">References</A></div> <div> <A HREF="info.htm" TARGET="_top" TITLE="HurterConsult News Info"><B>News & Info</B></A></div> <div> <A HREF="links.htm" TARGET="_top" TITLE="HurterConsult Favorite Links">Links</A></div> <div> <A HREF="contact.htm" TARGET="_top" TITLE="Contact HurterConsult">Contact Us</A></div> <div> <A HREF="legal_notice.htm" TARGET="_top" TITLE="Legal Notice About This Web Site">Legal Notice</A></div> <bR> <div> <A HREF="http://www.adobe.com/products/acrobat/readstep2.html" TARGET="_top" TITLE="http://www.adobe.com/products/acrobat/re"><IMG SRC="2f6581f0.png" border=0 width="88" height="31" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></A></div> </td> <td valign="top" colspan=2 height=100 style=" border-bottom: 1px solid #555555;" BGCOLOR="#009900" TEXT="#F7F7FF"> <div> <B>HurterConsult Incorporated</B></div> <div> <B>Consulting Engineers - Nonwood, Wood & Recycled Fiber Pulp, Paper, Fiberboard & Cellulosic Biofuel Projects</B></div> </td> </tr><tr> <td valign="top" height=380 width="100%" colspan=2 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <A HREF="info.htm" TARGET="_top" TITLE="HurterConsult News Info"><B>News & Info</B></A><B>  /</B><B> </B><B> </B><A HREF="straw_pulp_uses.htm" TARGET="_top" TITLE="Straw Pulp Uses in Papermaking"><B>Up</B></A><B>  /  </B><A HREF="nonwood_uses.htm" TARGET="_top" TITLE="Nonwood Plant Fiber Uses in Papermaking"><B>Down</B></A><B>  /  </B><A HREF="contact.htm" TARGET="_top" TITLE="Contact HurterConsult"><B>Contact Us</B></A><B> </B></div> <div> <B>  <FORM method=GET action="http://www.google.com/search" TARGET=_blank> <input type=hidden name=ie value=UTF-8> <input type=hidden name=oe value=UTF-8> <TABLE bgcolor="#FFFFFF"><tr><td> <A HREF="http://www.google.com/" TARGET=_blank> <IMG SRC=http://www.google.com/logos/Logo_40wht.gif border="0" ALT="Google" align="middle"></A> </td> <td> <INPUT TYPE=text name=q size=31 maxlength=255 value=""> <INPUT type=submit name=btnG VALUE="Google Search"> <input type=hidden name=domains value="www.HurterConsult.com"><br><input type=radio name=sitesearch value=""> Search WWW <input type=radio name=sitesearch value="www.HurterConsult.com" checked> Search www.HurterConsult.com <br> </font> </td></tr></TABLE> </FORM>   </B></div> <bR> <div> <B>United States Patent 6,302,997 - Process for producing a pulp suitable for papermaking from nonwood fibrous materials</B></div> <bR> <div>  <a href="HTMLobj-888/patent.pdf"><img align="bottom" border="0" width="153" height="17" alt="United States Patent 6,302,997" src="HTMLobj-888/download_pdf_LG_LARGE.gif"></a>  <FONT SIZE="2" COLOR="#111111" FACE="Arial" >(requires Adobe Reader).</FONT></div> <bR> <div> On October 16, 2001, United States Patent 6,302,997 was issued to Mr. Robert W. Hurter and Dr. Medwick V. Byrd for a "Process for producing a pulp suitable for papermaking from nonwood fibrous raw materials". The process is assigned to North Carolina State University (NCSU) and HurterConsult Incorporated.  </div> <bR> <div> The process includes the steps of providing a nonwood fiber source material; digesting the nonwood fiber source material with an alkaline pulping solution at at least about atmospheric pressure; reducing the pH of the nonwood fiber source material to an acidic pH with an acid solution; treating the nonwood fiber source material having an acidic pH with ozone; and treating the nonwood fiber source material with a bleaching solution to form a papermaking pulp. Representative nonwood fiber source materials include corn stover and wheat straw. </div> <bR> <div> Several of the key features of the process include:</div> <bR> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">low temperature, low pressure "extraction" step instead of traditional high temperature and pressure cooking resulting in lower energy consumption</div> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">ozone application in a manner that does not degrade fragile nonwood plant fibers</div> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">acid/ozone steps act as chemical depithing agents as well as traditional bleaching steps</div> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">ability to complete the bleaching using any of a variety of bleaching agents for either elemental chlorine free (ECF) or totally chlorine free (TCF) bleached pulp production</div> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">very short bleaching sequences which achieve moderate to high brightness depending on papermaking application</div> <div> <IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">maintenance of high pulp freeness and excellent pulp properties</div> <bR> <div> The full text of the patent can be viewed at <A HREF="http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6,302,997.PN.&OS=PN/6,302,997&RS=PN/6,302,997" TARGET="_top" TITLE="http://patft.uspto.gov/netacgi/nph-Parse">United States Patent: 6,302,997</A>. </div> <bR> <div> A paper titled "<A HREF="paptac_2005_paper.htm" TARGET="_top" TITLE="Simplified Pulping and Bleaching of Corn">Simplified Pulping and Bleaching of Corn Stalks</A>" which includes additional information was presented at the Pulp and Paper Technical Association of Canada (PAPTAC) 91st Annual Meeting - February 8, 2005.</div> <bR> <div> For further information regarding the technology and licensing opportunities, please contact one of the following:</div> <bR> <div> <A HREF="contact.htm" TARGET="_top" TITLE="Contact HurterConsult"><IMG BORDER="0" SRC="Symb075c00b7010400000000.png" HEIGHT="17" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Robert W. Hurter</A>, President, HurterConsult Incorporated</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f011111100.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Dr. Medwick V. Byrd, Ph. D., Director of Applied Research, Department of Wood and Paper Science, NCSU, e-mail: med_byrd@ncsu.edu</div> <div> <IMG BORDER="0" SRC="Symb075c00b700f011111100.png" HEIGHT="16" WIDTH="24" ALIGN="bottom" HSPACE="0" VSPACE="0">Dr. Dennis Thomas, Ph. D., Office of Technology Transfer and Industrial Research, NCSU, e-mail: dwthomas@gw.fis.ncsu.edu</div> <bR> <bR> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="3" WIDTH="98%" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="LEFT" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 2 WIDTH="100%"><div> <A HREF="index.htm" TARGET="_top" TITLE="HurterConsult Incorporated">Home</A> / <A HREF="philosophy.htm" TARGET="_top" TITLE="Our Process Technology Design Philosoph">Process Technology & Design Philosophy</A> /<B> </B><A HREF="expertise.htm" TARGET="_top" TITLE="Our Areas of Expertise">Areas of Expertise</A><B> </B>/<B> </B><A HREF="services.htm" TARGET="_top" TITLE="Our Scope of Services">Scope of Services</A> / <A HREF="cellulosic_biofuels.htm" TARGET="_top" TITLE="Cellulosic Biofuel">Cellulosic Biofuel</A></div> <div> <A HREF="references.htm" TARGET="_top" TITLE="HurterConsult Project References">Project References</A> / <A HREF="info.htm" TARGET="_top" TITLE="HurterConsult News Info"><B>News & Info</B></A> / <A HREF="links.htm" TARGET="_top" TITLE="HurterConsult Favorite Links">Links</A> / <A HREF="contact.htm" TARGET="_top" TITLE="Contact HurterConsult">Contact Us</A> / <A HREF="legal_notice.htm" TARGET="_top" TITLE="Legal Notice About This Web Site">Legal Notice</A></div> <bR> <div> <A HREF="straw_pulp_uses.htm" TARGET="_top" TITLE="Straw Pulp Uses in Papermaking"><B>Up</B></A><B>  /  </B><A HREF="nonwood_uses.htm" TARGET="_top" TITLE="Nonwood Plant Fiber Uses in Papermaking"><B>Down</B></A><B>  /  </B><A HREF="contact.htm" TARGET="_top" TITLE="Contact HurterConsult"><B>Contact Us</B></A></div> <div> <B>  <center> <FORM method=GET action="http://www.google.com/search" TARGET=_blank> <input type=hidden name=ie value=UTF-8> <input type=hidden name=oe value=UTF-8> <TABLE bgcolor="#FFFFFF"><tr><td> <A HREF="http://www.google.com/" TARGET=_blank> <IMG SRC=http://www.google.com/logos/Logo_40wht.gif border="0" ALT="Google" align="middle"></A> </td> <td> <INPUT TYPE=text name=q size=31 maxlength=255 value=""> <INPUT type=submit name=btnG VALUE="Google Search"> <input type=hidden name=domains value="www.HurterConsult.com"><br><input type=radio name=sitesearch value=""> Search WWW <input type=radio name=sitesearch value="www.HurterConsult.com" checked> Search www.HurterConsult.com <br> </font> </td></tr></TABLE> </FORM>   </B></div> <bR> <div> <B>Copyright © 2000-2008 HurterConsult Incorporated.  All rights reserved.</B></div> <bR> </tD> </tR> </TABLE></div> <bR> <bR> <bR> </td> </tr></table></body>