CA1039457A - Process for preparing organic pigments of high tinctorial strength and grain softness - Google Patents
Process for preparing organic pigments of high tinctorial strength and grain softnessInfo
- Publication number
- CA1039457A CA1039457A CA226,430A CA226430A CA1039457A CA 1039457 A CA1039457 A CA 1039457A CA 226430 A CA226430 A CA 226430A CA 1039457 A CA1039457 A CA 1039457A
- Authority
- CA
- Canada
- Prior art keywords
- tinctorial strength
- high tinctorial
- organic pigments
- pigment
- preparing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0001—Post-treatment of organic pigments or dyes
- C09B67/0014—Influencing the physical properties by treatment with a liquid, e.g. solvents
- C09B67/0015—Influencing the physical properties by treatment with a liquid, e.g. solvents of azoic pigments
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
PROCESS FOR PREPARING ORGANIC PIGMENTS OF HIGH TINCTORIAL
STRENGTH AND GRAIN SOFTNESS
Abstract of the disclosure:
An improved process for preparing an organic pigment having a high tinctorial strength by heating a crude organic pigment as an aqueous suspension having a consistency suitable for being pumped, to a temperature of from 80 to 300°C and for a period of from 10 seconds to 20 minutes in a continuously operating flow apparatus which is shaped as a heat exchanger provided with moving internal elements.
STRENGTH AND GRAIN SOFTNESS
Abstract of the disclosure:
An improved process for preparing an organic pigment having a high tinctorial strength by heating a crude organic pigment as an aqueous suspension having a consistency suitable for being pumped, to a temperature of from 80 to 300°C and for a period of from 10 seconds to 20 minutes in a continuously operating flow apparatus which is shaped as a heat exchanger provided with moving internal elements.
Description
" . ,..~
1(03~457 The present invention relates to a process for preparing organic pigments which have a high tinctorial strength and grain softness.
Copending Canadia~ Pat~t Appli~ation ~rial ~o. 166.881 relates to a process for preparing color-intense organic pigments by heating an aqueous suspension of an organic crude pigment having a consistency suitable for being pumped in a continuously operating flow apparatus to a temperature of from 80 to 300C for a period of from 10 seconds to 20 minutes, In modification to this process, it has now been found that, instead of using a flow apparatus, the continuous pressure finlsh of the aqueous pigment suspension can also be carried out using a continuously operating heat exchanger provided with moving internal elements. Such a heat exchanger provided with moving internal elements also allows pigment suspensions or pigment pastes having a substantially higher pigment concentra-tion to be processed than those according to the process dis-closed in the above-said patént application.
The prvcess of the invention can be carried out with particular advantage using any pressure-tight, cylindrical heat exchanger which is provided with one or more shafts or screws rotating or vibrating in its interior and which may also have stirring elements fixed on the moving parts or on its walls (~or exa~ple scrapers, wipers, fins, bars, rods, and so on), thus assuring a thorough mixing of the highly concentrated -pigment pastes and, due to this and to a simultaneous self-cleaning effect of the heat exchanger surfaces, a good heat transfer. Further advantages are the low pressure loss in the 29 apparatus and the possibility of increasing the heat exchange
1(03~457 The present invention relates to a process for preparing organic pigments which have a high tinctorial strength and grain softness.
Copending Canadia~ Pat~t Appli~ation ~rial ~o. 166.881 relates to a process for preparing color-intense organic pigments by heating an aqueous suspension of an organic crude pigment having a consistency suitable for being pumped in a continuously operating flow apparatus to a temperature of from 80 to 300C for a period of from 10 seconds to 20 minutes, In modification to this process, it has now been found that, instead of using a flow apparatus, the continuous pressure finlsh of the aqueous pigment suspension can also be carried out using a continuously operating heat exchanger provided with moving internal elements. Such a heat exchanger provided with moving internal elements also allows pigment suspensions or pigment pastes having a substantially higher pigment concentra-tion to be processed than those according to the process dis-closed in the above-said patént application.
The prvcess of the invention can be carried out with particular advantage using any pressure-tight, cylindrical heat exchanger which is provided with one or more shafts or screws rotating or vibrating in its interior and which may also have stirring elements fixed on the moving parts or on its walls (~or exa~ple scrapers, wipers, fins, bars, rods, and so on), thus assuring a thorough mixing of the highly concentrated -pigment pastes and, due to this and to a simultaneous self-cleaning effect of the heat exchanger surfaces, a good heat transfer. Further advantages are the low pressure loss in the 29 apparatus and the possibility of increasing the heat exchange
2 7~
~ HOE 74/F 126 ....
j~()39q~S7 surface in a rational manner by internally heating the moving parts and thus raising the throughput of product.
The concentration of the pigment pastes ranges from about 10 to ~0 percent by weight.
A precise control of the finishing process, which is possible by purposefully varying the temperature of the pigment suspension and its residence time in the apparatus, is the necessary condition for a rationalized pressure finish process of pigments. The compact arrangement of the heat exchanger of the invention offers not only an easy maintenance1 but also the advantage of reduced cost compared to conventional pressure finishing apparatus (large-volume stirrer containers, coils of pipe, pipe assembly exchangers) as well as increased operational safety of the apparatus, due to an only small volume under pressure. ~~
Owing to a very uniform dwe:Lling time of the material particles, the thermal treatment of aqueous pigment pastes in the heat exchangers of the inven-tion yields products having ~aluable technological properties.
The percentages given in the following Examples are by weight, the temperatures are given in centigrades. The - dwelling times are calculated from the product throughput and the volume of the heat exchanger used, in which the heating and cooling zones are advantageously arranged in one apparatus, ~5 one immediately behind the other, according to a variable mechanical assembly technique~ The pressures required depend on the temperature chosen and should always ~e above the saturation vapor pressure.
..
03~4S7 In a ring-gap heat exchanger formed by two slim concentric cylinders, of which the inner one rotated and carried mobile wipers on its circumference to shear the product without con-veying it, a 20 % aqueous paste of the crude pigment obtained by coupling anthranilic acid n butyl ester with 5-(2'-hydroxy-
~ HOE 74/F 126 ....
j~()39q~S7 surface in a rational manner by internally heating the moving parts and thus raising the throughput of product.
The concentration of the pigment pastes ranges from about 10 to ~0 percent by weight.
A precise control of the finishing process, which is possible by purposefully varying the temperature of the pigment suspension and its residence time in the apparatus, is the necessary condition for a rationalized pressure finish process of pigments. The compact arrangement of the heat exchanger of the invention offers not only an easy maintenance1 but also the advantage of reduced cost compared to conventional pressure finishing apparatus (large-volume stirrer containers, coils of pipe, pipe assembly exchangers) as well as increased operational safety of the apparatus, due to an only small volume under pressure. ~~
Owing to a very uniform dwe:Lling time of the material particles, the thermal treatment of aqueous pigment pastes in the heat exchangers of the inven-tion yields products having ~aluable technological properties.
The percentages given in the following Examples are by weight, the temperatures are given in centigrades. The - dwelling times are calculated from the product throughput and the volume of the heat exchanger used, in which the heating and cooling zones are advantageously arranged in one apparatus, ~5 one immediately behind the other, according to a variable mechanical assembly technique~ The pressures required depend on the temperature chosen and should always ~e above the saturation vapor pressure.
..
03~4S7 In a ring-gap heat exchanger formed by two slim concentric cylinders, of which the inner one rotated and carried mobile wipers on its circumference to shear the product without con-veying it, a 20 % aqueous paste of the crude pigment obtained by coupling anthranilic acid n butyl ester with 5-(2'-hydroxy-
3'-naphthoylamino)-benzimidazolone was heated under pressure to 170C for 6 minutes. A pigment powder was obtained which had the same qualities as those obtained by conventional methods only after a several-hour heating to 150C with the addition of o-dichlorobenzene (cf. German Patent Specification No.
1,217,008).
E X A M P L E 2:
In this case, a cylindrical finishing apparatus was used which was provided with two screws adequately arranged in such a manner that they necessarily cleaned themselves and simul-taneously the in-ternal wall o~ the cylinder. The active con-~eying effect on the product and thus the dwelling time of the pigment suspension could be varied via the rotational speed of the screws. In this apparatus, a 25 ~ paste of the crude pigment obtained by diazotization of anthranilic acid and coupling with 5-acetoacetylamino--benzimidazolone (according to German Offenlegungsschrfit No. 1,939,466) was heated under . pressure to 160C for 8 minutes. A well-dispersible pigment powder was obtained which differed from a product obtained hitherto by 2.5-hour heating to 150C in an increased tinctorial strength and a higher gloss of the lacquered articles produced therewith.
1,217,008).
E X A M P L E 2:
In this case, a cylindrical finishing apparatus was used which was provided with two screws adequately arranged in such a manner that they necessarily cleaned themselves and simul-taneously the in-ternal wall o~ the cylinder. The active con-~eying effect on the product and thus the dwelling time of the pigment suspension could be varied via the rotational speed of the screws. In this apparatus, a 25 ~ paste of the crude pigment obtained by diazotization of anthranilic acid and coupling with 5-acetoacetylamino--benzimidazolone (according to German Offenlegungsschrfit No. 1,939,466) was heated under . pressure to 160C for 8 minutes. A well-dispersible pigment powder was obtained which differed from a product obtained hitherto by 2.5-hour heating to 150C in an increased tinctorial strength and a higher gloss of the lacquered articles produced therewith.
Claims
We claim:
In a process for preparing an organic pigment having a high tinctorial strength by heating a crude organic pigment as an aqueous suspension having a consistency suitable for being pumped in a continuously operating flow apparatus to a temperature of from 80 to 300°C and for a period of from 10 seconds to 20 minutes, the improvement which comprises heating the suspension of the crude pigment in a flow apparatus shaped as a heat exchanger which is provided with moving internal elements.
In a process for preparing an organic pigment having a high tinctorial strength by heating a crude organic pigment as an aqueous suspension having a consistency suitable for being pumped in a continuously operating flow apparatus to a temperature of from 80 to 300°C and for a period of from 10 seconds to 20 minutes, the improvement which comprises heating the suspension of the crude pigment in a flow apparatus shaped as a heat exchanger which is provided with moving internal elements.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742422182 DE2422182B2 (en) | 1974-05-08 | 1974-05-08 | PROCESS FOR THE PRODUCTION OF THICK COLOR AND GRAIN-SOFT ORGANIC PIGMENTS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1039457A true CA1039457A (en) | 1978-10-03 |
Family
ID=5914939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA226,430A Expired CA1039457A (en) | 1974-05-08 | 1975-05-07 | Process for preparing organic pigments of high tinctorial strength and grain softness |
Country Status (12)
| Country | Link |
|---|---|
| JP (2) | JPS50150725A (en) |
| AR (1) | AR212803A1 (en) |
| BE (1) | BE828885A (en) |
| BR (1) | BR7502802A (en) |
| CA (1) | CA1039457A (en) |
| CH (1) | CH570449A5 (en) |
| DE (1) | DE2422182B2 (en) |
| DK (1) | DK200875A (en) |
| FR (1) | FR2284648A1 (en) |
| GB (1) | GB1495315A (en) |
| IT (1) | IT1046393B (en) |
| NL (1) | NL7505218A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2800815C2 (en) * | 1978-01-10 | 1986-12-11 | Basf Ag, 6700 Ludwigshafen | Process for the production of easily distributable and opaque isoindoline pigment dyes |
-
1974
- 1974-05-08 DE DE19742422182 patent/DE2422182B2/en not_active Ceased
-
1975
- 1975-05-02 NL NL7505218A patent/NL7505218A/en not_active Application Discontinuation
- 1975-05-05 CH CH574875A patent/CH570449A5/xx not_active IP Right Cessation
- 1975-05-06 JP JP5329375A patent/JPS50150725A/ja active Pending
- 1975-05-06 IT IT2308775A patent/IT1046393B/en active
- 1975-05-07 FR FR7514325A patent/FR2284648A1/en active Granted
- 1975-05-07 DK DK200875A patent/DK200875A/en unknown
- 1975-05-07 BR BR7503574D patent/BR7502802A/en unknown
- 1975-05-07 CA CA226,430A patent/CA1039457A/en not_active Expired
- 1975-05-07 GB GB1915275A patent/GB1495315A/en not_active Expired
- 1975-05-09 BE BE156191A patent/BE828885A/en unknown
- 1975-11-07 JP JP13317175A patent/JPS5169523A/en active Pending
-
1978
- 1978-05-06 AR AR25865278A patent/AR212803A1/en active
Also Published As
| Publication number | Publication date |
|---|---|
| BR7502802A (en) | 1976-03-16 |
| NL7505218A (en) | 1975-11-11 |
| JPS50150725A (en) | 1975-12-03 |
| AU8086675A (en) | 1976-11-11 |
| CH570449A5 (en) | 1975-12-15 |
| DE2422182A1 (en) | 1975-11-13 |
| DK200875A (en) | 1975-11-09 |
| IT1046393B (en) | 1980-06-30 |
| GB1495315A (en) | 1977-12-14 |
| DE2422182B2 (en) | 1976-07-01 |
| JPS5169523A (en) | 1976-06-16 |
| AR212803A1 (en) | 1978-10-13 |
| FR2284648A1 (en) | 1976-04-09 |
| FR2284648B1 (en) | 1982-05-28 |
| BE828885A (en) | 1975-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69633748T2 (en) | Food containing thermally inhibited, pregelatinized non-granular starch or flour | |
| CA1039457A (en) | Process for preparing organic pigments of high tinctorial strength and grain softness | |
| US4929580A (en) | Process for treating clay minerals | |
| GB649324A (en) | Improvements in or relating to the processing of starch pastes | |
| US3071492A (en) | Method of rendering starch hydrophobic and free flowing | |
| US4302254A (en) | Process for the manufacture of pigment preparations | |
| CN102964868A (en) | Preparation method for easily-dispersed phthalocyanine blue 15: 4 | |
| US4156617A (en) | Process for preparing organic pigments of high tinctorial strength and grain softness | |
| JPH0680899A (en) | Water-base wet process for producing modified beta-quinacridone pigment | |
| US2138049A (en) | Drying pigments | |
| CN106732258A (en) | A kind of mixed material mixing plant that need to be heated | |
| US4083733A (en) | Method of producing beta-lactose | |
| CN111944332A (en) | Method capable of remarkably improving coloring power of iron oxide red | |
| US2783167A (en) | Process for simultaneously gelatinizing and catalytically modifying starch suspensions | |
| Cooke et al. | Thermal properties of polysaccharides at low moisture: II. Molecular order and control of dissolution temperature in agar | |
| JP6698048B2 (en) | Method for producing powdery water-soluble nonionic cellulose ether having high bulk density | |
| CN108640696A (en) | A kind of production method of kiln special-purpose fire-resistant material | |
| US707985A (en) | Process of making laundry starch. | |
| CN1076729C (en) | Granular starch dissolvable in cold water and preparation thereof | |
| RU2101258C1 (en) | Method for producing bentonite powder | |
| US4009180A (en) | Continuous process for preparing copper phthalocyanine | |
| JPS5850266B2 (en) | Production and preparation method of copper phthalocyanine | |
| CN113881242B (en) | Preparation method of pigment yellow PY138 product with low yield value for iron printing ink | |
| CN207872151U (en) | Carboxymethyl cellulose produces special ether-based device | |
| US1677314A (en) | Process for making cold swelling starch |