Patent BR-0213904-B1 (BR)
Inventor: STOEFER ECKHARD
IPC: C07C31/20
Filed: 2002-11-05
Abstract: In an aqueous formaldehyde solution comprising formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in a total concentration x of >=65% by weight, the mean molar mass {overscore (M of the polyoxymethylene glycols is, as a function of the formaldehyde concentration, equal to or less than the values given by equation I: <maths id="MATH-US-00001" num="00001"> <MATH OVERFLOW="SCROLL"> <MTABLE> <MTR> <MTD> <MTABLE> <MTR> <MTD> <MTABLE> <MTR> <MTD> <MROW> <MROW> <MO>(</MO> <MFRAC> <MOVER> <MI>M</MI> <MI>_</MI> </MOVER> <MROW> <MI>g</MI> <MO>⁢</MO> <MSTYLE> <MTEXT>/</MTEXT> </MSTYLE> <MO>⁢</MO> <MI>mol</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MO>=</MO> <MROW> <MN>48</MN> <MO>+</MO> <MROW> <MN>6.589</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MROW> <MO>-</MO> <MN>1</MN> </MROW> </MSUP> <MO>.</MO> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> </MROW> <MO>+</MO> <MROW> <MN>4.725</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MN>2</MN> </MSUP> <MO>.</MO> </MROW> </MROW> </MROW> </MTD> </MTR> <MTR> <MTD> <MROW> <MSTYLE> <mspace width="7.2em" height="7.2ex"/> </MSTYLE> <MO>⁢</MO> <MROW> <MSUP> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MN>2</MN> </MSUP> <MO>-</MO> <MROW> <MN>3.434</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MROW> <MO>-</MO> <MN>3</MN> </MROW> </MSUP> <MO>.</MO> <MSUP> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MN>3</MN> </MSUP> </MROW> <MO>+</MO> </MROW> </MROW> </MTD> </MTR> </MTABLE> </MTD> </MTR> <MTR> <MTD> <MROW> <MSTYLE> <mspace width="7.5em" height="7.5ex"/> </MSTYLE> <MO>⁢</MO> <MROW> <MROW> <MN>9.625</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MROW> <MO>-</MO> <MN>5</MN> </MROW> </MSUP> <MO>.</MO> <MSUP> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MN>4</MN> </MSUP> </MROW> <MO>-</MO> <MROW> <MN>1.172</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MN>6</MN> </MSUP> <MO>.</MO> </MROW> </MROW> </MROW> </MTD> </MTR> <MTR> <MTD> <MROW> <MSTYLE> <mspace width="6.9em" height="6.9ex"/> </MSTYLE> <MO>⁢</MO> <MROW> <MSUP> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MN>5</MN> </MSUP> <MO>+</MO> <MROW> <MN>5.357</MN> <MO>.</MO> <MSUP> <MN>10</MN> <MROW> <MO>-</MO> <MN>9</MN> </MROW> </MSUP> <MO>.</MO> <MSUP> <MROW> <MO>(</MO> <MFRAC> <MI>x</MI> <MROW> <MI>%</MI> <MO>⁢</MO> <MSTYLE> <mspace width="1.4em" height="1.4ex"/> </MSTYLE> <MO>⁢</MO> <MI>by</MI> <MO>⁢</MO> <MSTYLE> <mspace width="0.8em" height="0.8ex"/> </MSTYLE> <MO>⁢</MO> <MI>weight</MI> </MROW> </MFRAC> <MO>)</MO> </MROW> <MN>6</MN> </MSUP> </MROW> </MROW> </MROW> </MTD> </MTR> </MTABLE> </MTD> <MTD> <MROW> <MO>(</MO> <MI>I</MI> <MO>)</MO> </MROW> </MTD> </MTR> </MTABLE> </MATH> </MATHS> where: {overscore (M is the mean molar mass, and x is the total concentration of formaldehyde in the form of monomeric formaldehyde, methylene glycol and polyoxymethylene glycols in % by weight (total formaldehyde concentration).