US1162036A - Process of redistillation of products resulting from destructive distillation of resinous wood. - Google Patents

Description

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:cARoLINA; e CORPORATION or NOE-TH CAROLIN :frnocnss or nnms'rrrra'rroiv or rnonucrsgammanrs'rrrrarrou or ansmouswoon,

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To al l whom it may concern:

Be it known that we, HAR LD CHAsEj; anctJoHX L. GRA FL'IN, citizens for the modification of the broad pr United States, residing atlVilmington, in

the county. of New Hanover, State of North used to heat thematei Carolina, have invented certain new and usefulImprovements in Processes of Redis--' tillation'of Products Resulting from Detructive Distillation of Resinous WVood, of which the following is a description.

Our invention relates to a process of redistillation of products produced from resinous woods by destructive distillation, and

has for its object to produce from such products, which are necessarily so characterized by creosote odor or tarry odor and by heavy residual matter, as to render them incapable of use except for preserving wood or other material and other uses in which their odor is not objectionable,- oils which are clear, viscid, free from creosote or creosote odor and capable of use for purposes such as those for which so-called rosin oil is used.

.By subjecting these products, such as creosote oil, pitch and tar, or mixtures thereof,-

to redistillation 'at a temperaturenot above 500 degrees Fahrenheit a light creosote -.oil may be driven off which carries all of the creosote odor, and by then further distilling at a higher temperature, not over.700 deoitwhich is free from creosote odor and re sembles rosin oil in appearance and characteristics, and which is of relatively high value compared with the market value of the creosote oil or pitch or tar. This process is not broadly claimed herein, being the subject-matter of a separate application forpatent filed by us under date of April 17,

1915, Serial No. 22,030.

. We have discovered that by using super heated steam blown directly into and through the contents of the still or retort to effect the distillation, either with or without the use of heat from other sources applied to the exterior of the retort or otherwise, the light creosote oil may be driven off at a much lower temperature than can be done where the contents of the retort are treated without the use of the steam, and in driving oil the clear, viscid oil the use .of

superheated steam makes it possible to ac- Hiinorarour. cHAsE ANDJOHN GRAFFLIN, or 'WILMlINGTDN4 assreuoras TO- NATIONAL-ween nIsTrL-Lmc ooMrAivY,-or WI ap n'cationmea April 17, 1915; Seria1No.22,031.

complish this at a o otherwise possible.

O nt-c invention 0 IlS'ISfiS wood creosote oil, pitch or tar, or any prodnot containing any of these substances, into a still or retort, which may be of any usual construction, but which is preferably provided with heating means capable of regulation so as to heat the contents of the still or retort to a predeterminedtemperature and maintain such contents at suchtemperature, and is also provided with a pipe leading into it, through which sup'erhe'ate'd'steam may be blown into andthrough the contents of the still. The still or retort being properly charged the superheated steam is turned on and the distillation process begins. The contents of the still or retort being heated by the'superheated steam, either' with. or without additional heat applied to the eX- terior of the still or retort or otherwise, to a temperature not exceeding 390 degrees Fahrenheit, a light creosote oil is driven off. By maintaining the heat for a suitable length of time all of this light creosote oil contained in the material in the still or retort may be driven ofi without raising the temperature above 390 degrees, the amount of light, creosote oil driven 011' depending on the character of the contents of the still or retort, the amount being comparatively small if the contents of the still or retort consist wholly or mainly of pitch or tar and comparatii'ely large if the contents consist wholly or ,largelyof creosote oil. The initial temperature required will also vary somewhat with the character of the contents of the still or retort, the drawing 05 of the light creosote oil beginning at a lower temperature when the contents are made up wholly or largely of creosote oil than when they consist largely of pitch or tar. And

the same is true in the drawing ofi' of the clear, viscid oil, the heat required being less when the proportion of creosote oil in the original charge greater.

After the light creosote oil has been driven ofi', the contents 'of the still is raised by the superheated steam either with or without additional heat applied to the exterior of its retort or still or otherwise, 'to a temperature not exceeding 500 F during which period ofthe process, a large proportion of the remaining contents of the still is driven off as a clear viscid oil, leaving a comparatively sniall i'esidue.

ucts to a temperature not exceeding 390' degrees Fahrenheit, by forcing superheated steam through them until all substances havmg -a creosote odor have been driven off,

raising the remainder to a temperature to 1.1e2,ose

not exceeding 500 degrees ,Fahrenheit and Which'consists in heating such products to a temperature not exceeding 390 degrees Fahrenheit by forcing superheated steam through them and by applying other heat to them, maintaining them at such temperature until all substances having a creosote odor are driven off, raising the remainder to a temperature not exceding 500 degrees Fahrenheit and forcing superheated steam through such remainder to distil oil? oil free from creosote odor.

This specification signed and witnessed this 18th day of May A. D. 1914.

HAROLD M. CHASE. JOHN L. GRAFFLIN.

I In the presence of-- C. B. HARRiss, M. I. HARRISS,