Simple Cooking from Frozen Vegetables

I know, it's healthier to use fresh vegetables than frozen vegetables. But after I see the composition on the frozen vegetables package, it's safe! Because the composition is only the vegetables (carrot, corn, peas, and beans), not added by preservative or even salt and sugar. So I decide to cook using it and I find that those vegetables can be cooked in some recipes variation that relative simple. Yeay! Here they are:

1. Vegetable Soup

Slice onion and garlic, put in in a pan. Add water until boiling. Put frozen vegetables to the pan and then add salt, sugar, and pepper. You can also add meatball, sausage, quail eggs, macaroni, chicken, or fish fillet to the soup!

2. Vegetable Saute

Boil frozen vegetable in the water and then drain. Slice onion and garlic. Put cooking oil in the pan and then add onion and garlic. After that, put the cooked frozen vegetable, salt, sugar, and pepper. Stir well. You can also add meatball, sausage, or any other ingredients you want to add :)

3. Vegetable Omelet

Boil frozen vegetable in the water and then drain. Stir eggs in a bowl and then add salt, pepper, and the vegetable. Cook in a pan. Tadda! Your veggie omelet is done.

4. Vegetable Fried Rice

Boil frozen vegetable in the water and then drain. Slice onion and garlic. Put margarine in the pan and then add onion and garlic. Add egg to the pan and then stir. Add rice, vegetable, salt, and pepper. Stir well. It's done!

5. Vegetable "Bakwan"

Boil frozen vegetable in the water and then drain. Put flour in a bowl, add water and then stir. Put the vegetables in the bowl and add salt and pepper. Heat cooking oil in a pan fry, deep fry one spoon table vegetable dough in the oil. Do it until the dough is all over.

6. Vegetable "Risol"

Boil frozen vegetable in the water and then drain. Boil quail eggs and then peel the shell. Mix the vegetable and quail eggs until the eggs is delicate. Prepare spring roll skin, add one spoon table mixed vegetable and egg. Roll the spring roll skin and stick the border with egg white. Deep fry the "risol". Nyaaam :9

The Veggie "Risol"

I Love Shoes

Fashion item that I love (beside clothes and hijab) is a pair of shoes. I like to match it with the color of my clothes that I wear that day hehehe.. So girly isn't it? Basically, I like a comfort shoes like flat shoes but I don't refuse to wear wedges or heels even though I still learn to use it properly ;) For sandals, now I am very keen on Zhoelala Jelly Slippers from Bangkok. You can check @pearlpastel on Instagram for this cute sandals :)

The Flats Families

Wedges & Heels

Zhoelala Jelly Slippers

A woman with good shoes is never ugly - Coco Chanel

Give a girl the right shoes, and she can conquer the world - Marilyn Monroe

Acid Gas Removal (Part 2: Iron Sponge)

Below is explanation about Iron Sponge:

• Use chemical reaction: 2 Fe2O3 (ferric oxide) + 6 H2S ---> 2 Fe2S3 + 6 H2O
• Applied to gas with low H2S concentration (300 ppm). Carbon dioxide is not removed by this process Operating at low to moderate pressure (50-500 psig) 
• Temperature below 110 F 
• Need alkaline water with pH level 8-10. Injection of caustic soda with water into inlet gas stream is needed if the water is not sufficient 
• Ferric oxide is impregnated on wood chips to produce large surface area. Common grades based on iron oxide content are: 6.5, 9.0, 15.0, 20 lb iron oxide/bushel 
• Gas scrubber or filter separator on upstream of iron sponge unit is needed to minimize amount of hydrocarbon liquids condense to bed. Hydrocarbon liquids can coat iron sponge and inhibiting the reaction. The scrubber operates at lower temperature or higher pressure than iron sponge unit, to prevent possibility hydrocarbon liquids condensing in iron sponge unit. 
• Normally operated in batch mode without regeneration due to difficulty of controlling regeneration step, the eventual coating of the bed with elemental sulfur, the low cost of iron material, and the possibility of hydrocarbon liquids coating the bed. 
• The spent bed is removed from the unit and trucked to disposal site. It is replaced with a new bed and the unit put back in service.

Amine Treating Unit will be explained in next post :)

Reference:
DMAN-TPE-ENGPRO-008 Acid Gas Treating Design Manual

Acid Gas Removal (Part 1)

Continuing the explanation about LNG, I will try to summary each of LNG process steps from reference I read. First is about Acid Gas Removal.

Acid gas such as CO2, H2S, and other sulfur compounds like mercaptant are need to be removed because they cause corrosion and reduce heating value (sales value) of the gas. Typically, gas sales contracts will permit up to 2-3% CO2 and 1/4 grain per 100 standard cubic feet/scf (approximately 4 ppm) H2S.

Below are explanation about some acid gas removal processes.

1. Solid Bed Absorption

Using a fixed bed of solid to remove acid gases through chemical reaction or ionic bonding and hold acid gases in the bed. After the bed is saturated with acid gases, the vessel is out of service and the bed is regenerated or replace. Thus, some spare capacity must be provided. Three commonly used processes under this category are:

- Iron Sponge
- Molecular Sieve
- Zinc Oxide

2. Chemical Solvents

Chemical solvent processes use an aqueous solution of a weak base to chemically react with and absorb the acid gas in the natural gas stream. The absorption occurs as a result of driving force of the partial pressure from the gas to liquid. The reaction involved are reversible by changing the system temperature and pressure, or both. Therefore, the aqueous base solution can be regenerated and thus circulated in a continue cycle. The majorities of chemical solvent processes use either an amine or carbonate solution which are:
- MEA (Monoethanol Amine)
- DEA (Diethanol Amine)
- DGA (Diglycol Amine)
- DIPA (Diisopropanol Amine)
- K2CO3 (Potassium Carbonate)
- Proprietary Carbonate (K2CO3 with activator or catalyst)

3. Physical Solvents

This process is based on solubility of H2S and/or CO2 within the solvent. Solubility is depends on partial pressure and temperature. Higher acid gas partial pressure and lower temperature increase the solubility H2S and CO2 in the solvent.

Most physical solvent processes are proprietary and are licensed by the company that developed the process such as:
- Fluor Solvent
- Sulfinol (Shell)
- Selexol (Allied Chemical Company)
- Rectisol (The German Lurgy Company and Linde A. G.)

4. Direct Conversion H2S to Sulfur

The release of H2S to atmosphere may be limited by environmental regulations. Usually acid gas is routed to incinerator or flare. Or otherwise, H2S can be oxidized to produce elemental sulfur by chemical reaction. These processes are licensed and involve specialized catalyst and/or solvents. Some of the processes are:
- Clause
- LOCAT
- Stretford (British Gas Corporation)
- IFP (Institute Francais du Petrole)

5. Distillation

The Ryan- Holmes distillation process uses cryogenic distillation to remove acid gases from a gas stream. This process is applied to remove CO2 for LPG separation or where it is desired to produce CO2 at high pressure for reservoir injection.

6. Gas Permeation

This process is based on the mass transfer principles of gas diffusion through a permeable membrane. The driving force for the separation is differential pressure. Membrane system can effectively remove CO2 and water but not H2S. The side of membrane that is rich in CO2 is normally operated of 10 to 20% of the feed pressure. Membrane are a relatively new technology. They are attractive economic alternative for treating CO2 from small streams (up to 10 MMscfd).

The most common process that is used are Iron Sponge and Amine Treating Unit. They will be explained in 2 next post :)

Reference:
DMAN-TPE-ENGPRO-008 Acid Gas Treating Design Manual

Weekend @ Mall

Basically, me and my husband don't very much like go to the mall. Usually we go to parents' house, shop groceries for one week or have a street culinary on the weekend ;) But last weekend, we went to malls that we have not been visited.

On Saturday, we went to Bintaro Xchange Mall. It's a new mall indeed, near Bintaro toll exit. It's a big mall even though not all of stores have been opened. We bought some breads at Bread Talk and dinner at Fiesta Steak. After that, we watch live music outdoor. Enjoying a Saturday night ambiance :)

And then on Sunday, we went to Margo City Depok. Actually, we only plan to eat ramen located at Margonda Raya that we seen on TV, but it was sold out (hahahah). Until we decided to go to the mall again because of the weather is kinda rainy. In there, we had a dinner at Ichiban Sushi. I ordered spicy ramen and my hubby ordered Beef Bento. But in the end, I eat my hubby's food because I can't endure the spiciness of ramen ;p After that we tried new JCo products which is happening now: Cronut.

The photos below are my daughter's photos on last weekend:

 Seeing the fountain @ BXc

  Sitting on a high chair @ Fiesta Steak

 

 And now, I have a flu and cough because of not having rest while weekend!!! Hehehe..

LNG (Liquefied Natural Gas)

In the new office, I am assigned in one of Indonesia LNG Project located at Papua which is BP LNG Tangguh. Even though the project has not been started yet, I have to start learn about it because I never do LNG project before.

Below is the simple brief explanation about LNG, result of me reading some references in this one week :)

LNG is liquefied natural gas, used as fuel that cleaner than oil fuel. Natural gas is processed and liquefied to be liquid. Why must it change to liquid? Because gas distribution using pipeline is restricted by distance. Many gas sources are located far from users. To reach far users, LNG is sent by tanker. Beside that, gas volume in liquid phase is 600 times less than gas volume in vapor state. So liquid phase can reduce space for LNG distribution.

Liquefaction is a cryogenic system, due to natural gas cooling to below boiling point which is about -160 degree Celcius. LNG is stored at atmospheric pressure in a tank that has double wall and insulated to prevent boil off gas. Before sent to customer, LNG is reheated so can back to vapor phase.

Process steps to change natural gas to LNG are:

1. Acid Gas Removal, to remove acid components such as Carbon Dioxide and Sulfur that corrosive to the material and will also freeze while liquefaction process. Usually, Amine Treating Unit is used to remove this acid component.

2. Dehydration, to remove water that also corrosive and freeze while liquefaction process. Usually, industry uses molecular sieve to remove water.

3. Mercury Removal, to remove mercury component that can damage alumunium material. Usually aluminium is used as cryogenic heat exchanger material. To remove mercury, a bed that sulfur impregnated, carbon activated, and non-regenerative is used in industry.

4. Heavier components removal, to prevent solidification of this component by using condensation and distillation process.

5. Liquefaction, to cool gas to below its boiling points by using heat exchanger. Usually use propane and mixed refrigerants (N2, CH4, C2H6, and C3H8) as cooling medium. Refrigeration cycle is used in this liquefaction process.

6. N2 rejection, to remove N2 component from LNG because N2 is still in gas phase at the natural gas boiling point (not change to liquid phase).

7. Storage in LNG tanks and loading to tanker.

Below is a simple diagram of LNG Process:

 

Finally, a post about my job as a process engineer hehe..

I hope you are not feeling dizzy and this post still gives you information :)

References:
1. LNG Handout Slide by Aday Wakhid Nurhidayat & Irfa Nauli - Tripatra
2. DMAN-TPE-ENGPRO-006 LNG Plant Manual
3.  Project Description: LNG Plant by Arrow LNG Plant

Good Bye and Hello

Last Friday was the last day of me being employee in Singgar Mulia. There were a lot of memories when I was there for three years. I also know that I have so many flaws when I started working there. But I take it as a lesson of life :) The most important thing that I learn a lot in there, not only learn technical knowledge, but also learn to be mature and to be grateful for what I have. And more of that, I find real friends, who come and go but still be friends. 

Below are some photos on my last day. And I will keep it as memory in my mind. A good memory :)

Process & Safety Team

Process, Safety, and Some Neighbors

 With HOD and The 'Resign' Team (hahaha)

Me and My Neighbor :)

I hope, in my new working place, I can become better employee, better engineer, find new best friends, and the most important thing is be happier in living my life. Aamiin :)