No.1
! d s u c c e s s f u l Uses of ( T E T R A H Y D R 0F U R F U R Y
L ALC 0H01)
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LETTERS
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Handling Hydrazine Solutions
DEARDR. FOXTANA: In your Corrasion c*olurnn,page 82 .A of October 1955 issue of I&EC, you state! “ . . . . ..Asbestos impregnated with carbon is not recommended for gaskets or packing.” JTe would appreciate further ndvice on where we may get further inforniat’ion on asbestos impregnated with carbon.
(Photos courtesy of California Spray-Chemical Corporation)
Jos. L. GILL~IIAS, ,JIL Consulting Engineer Kashington 5> D. C.
Dr. Fontaria suggests contacting Rod Teel. International Sickel C‘o., Harbor Island. S . C.
Quality Control Courses
DEARDR. YOUDES: I have heen attempting t o find some university which offers correspondence or ertensiori courses on basic theory u i i d application of statistical Quality Control anti Analysis of Data. Could you recommend some universitl- giving such a course, or alternatively suitalde test?
California Spray-Chemical Corporation, Richmond, California, makers of Ortho* herbicides.
Company:
To produce a nonvolatile herbicide that clings to brush and weeds until they’re killed and control possible vapor injury to adjacent sensitive crops.
Problem:
A. L. \VISFII.:I,D Production Xanager
2,4-Dichlorophenoxyaceticacid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) are converted to tetrahydrofurfury1 alcohol esters which have low volatility and contain maximum percentages of 2,4-D and 2,4,5-T components for effective herbicidal activity.
Solution:
End Product:
Manistee Salt Works IIanistee, Xich.
A nonvolatile, effective herbicide that stays put longer. ~
(1) THFA is easy to esterify and handle. ( 2 ) The resulting THFA esters of 2,4-D and 2,4,5-T are easily soluble in the majority of organic solvents and insoluble in water.
Side Benefits:
yourself. Its successes are numerous. THFA is a versatile solvent for many resins and dyes, a useful chemical intermediate and finds a large market in the synthesis of plasticizers for vinyl resins.
Check Into THFA
Write for
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Bulletin 8 7 C on THFA
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‘Reg. U. S. P a t . Off., C a l i f o r n i a S p r a y - C h e m i c a l C o r p o r a t i o n
For f u r t h e r information, c i r c l e number 52 A on Readers’ Service Card, page 105 A
52 A
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D R . Y O U D E S ’ S -$SSWER:
I enclose :i t)ihliography of literature --published in A n a l . Chem. 24, 120 (1952). See page 121 for citations t o Qiiniity Control. -1similar article hy Xnndel nncl Liming will :ippear in this same journal n-ith additional (‘itations in AApril1956. Several institutions offer slioi,t (one 1r.eek or 10 (lays) courses: one is S o r t h C:irolinn State College, K:ileigh. S . C:. The Rochester Institute of Tech-
Department of Mathemitics.
INDUSTRIAL AND ENGINEERING CHEMISTRY
Vol. 48,No. 3
